The layer silicate Cs2SnIVSi6O15

Ketter, M.; Weil, M.

doi:10.1107/S2056989021013554

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Volume 78| Part 2| February 2022| Pages 111-113

https://doi.org/10.1107/S2056989021013554

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The layer silicate Cs₂Sn^IVSi₆O₁₅

Michael Ketter ^a and Matthias Weil ^a ^*

^aInstitute for Chemical Technologies and Analytics, Division of Structural Chemistry, TU Wien, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria
^*Correspondence e-mail: matthias.weil@tuwien.ac.at

Edited by S. Parkin, University of Kentucky, USA (Received 7 December 2021; accepted 23 December 2021; online 7 January 2022)

Single crystals of Cs₂SnSi₆O₁₅, dicaesium tin(IV) hexasilicate, were serendipitously obtained from a CsCl/NaCl flux at 923 K, starting from mixtures of CaO, SnO and TeO₂ in a closed silica ampoule. The crystal structure of Cs₂SnSi₆O₁₅ is constructed from {Si₆O₁₅}^6– layers extending parallel to (101), and Cs^I cations with a coordination number of eleven as well as isolated [SnO₆] octahedra situated between the silicate layers. Each of the nine different SiO₄ tetrahedra in the silicate layer has a connectedness of Q³ (three bridging and one terminal O atom), which leads to the formation of five- and eight-membered rings. The same type of silicate layer is found in the crystal structure of the mineral zeravshanite. Comparison with other silicates of the type Cs₂M^IVSi₆O₁₅ (M^IV = Ti, Zr, Th, U) revealed a klassengleiche group–subgroup relationship of index 2 between Cs₂ZrSi₆O₁₅ (Z = 6, space group C2/m) and Cs₂SnSi₆O₁₅ (Z = 12, space group I2/c).

Keywords: crystal structure; group-subgroup relation; caesium; tin; silicates.

CCDC reference: 2130669

1. Chemical context

Calcium oxotellurate(IV), CaTeO₃, is known to exist in various polymorphic forms that can be obtained either through solid-state reactions (Trömel & Ziethen-Reichenach, 1970 ; Stöger et al., 2009 ) or under hydrothermal conditions and subsequent dehydration (Poupon et al., 2015 ). Some of the CaTeO₃ polymorphs have a non-centrosymmetric crystal structure and show ferroelectric behaviour (Rai et al., 2002 ) or a second harmonic generation (SHG) effect (Poupon et al., 2015). These features are thought to be related to the presence of the 5s² electron lone pair at the Te^IV atom. In a current study it was attempted to incorporate Sn^II into CaTeO₃ under formation of solid solutions (Ca_1-xSn_x)TeO₃ in order to investigate whether the 5s² electron lone pair at the Sn^II atom has any influence on the ferroelectric or SHG characteristics. For that purpose, a flux medium consisting of a eutectic CsCl/NaCl mixture with a melting point of 766 K (Żemcżużny & Rambach, 1909 ) was chosen as reaction medium in a closed silica ampoule. In comparison with conventional ceramic routes, this allows the lowering of the reaction temperatures by a simultaneous increase of the diffusion pathways. However, neither the intended (Ca_1-xSn_x)TeO₃ solid solutions nor other calcium oxotellurates with a partial replacement of Ca^II by Sn^II could be prepared this way. One of the side products of this reaction was Cs₂Sn^IVSi₆O₁₅, which had formed through attack of the silica glass ampoule by the molten salt mixture and concomitant oxidation of Sn^II to Sn^IV. Its crystal structure along with a structural comparison with other silicates is given here.

2. Structural commentary

The asymmetric unit of Cs₂SnSi₆O₁₅ comprises three Cs, two Sn, nine Si and twenty-three O sites. Except for one Sn site (Sn2) and one O site (O23), which are located on Wyckoff positions 4b (site symmetry $[\overline{1}]$ ) and 4e (site symmetry 2), respectively, all atoms are on general positions. The crystal structure of Cs₂SnSi₆O₁₅ can be described as being built up from silicate layers extending parallel to (101). The silicate layers are linked by caesium cations and isolated [SnO₆] octahedra situated between adjacent silicate layers (Fig. 1).

Figure 1
The crystal structure of Cs₂SnSi₆O₁₅ in a projection along [0 $[\overline{1}]$ 0]. Cs sites are given in blue, [SnO₆] octahedra in orange and SiO₄ tetrahedra in red. Displacement parameters are drawn at the 74% probability level. For clarity, the disordered Cs3 site with minor occupancy (Cs3B) is not shown. [Symmetry code: (i) x, y + 1, z + 1.]

Each of the three caesium cations exhibits a coordination number of 11, with Cs—O bond lengths ranging from 2.951 (3) to 3.748 (3) Å. The mean Cs—O bond lengths for the three individual [CsO₁₁] polyhedra (Cs1: 3.312 Å; Cs2: 3.355 Å; Cs3: 3.342 Å) are in very good agreement with the overall mean Cs—O bond length of 3.333 (226) Å calculated from 748 bonds for 11-coordinate Cs (Gagné & Hawthorne, 2016 ). The two Sn^IV atoms show slight deviations from a regular octahedral coordination, with Sn—O bond lengths ranging from 2.031 (3) to 2.058 (3) Å. The overall mean Sn^IV—O bond length of 2.054 (10) Å calculated from 32 bonds (Gagné & Hawthorne, 2018 ) is somewhat longer than the mean values for Sn1 (2.037 Å) and Sn2 (2.047 Å).

All of the nine SiO₄ tetrahedra in the {Si₆O₁₅}^6– layer have one terminal O atom and are linked to three other SiO₄ tetrahedra by common bridging O atoms. Thus, the connectedness of the silicate tetrahedra is Q³ according to the notation of Liebau (1985 ). The bond lengths distribution in the SiO₄ tetrahedra reflects the different roles of the O atoms in the silicate layer. The Si—O bonds to terminal O atoms are shorter by about 0.03 Å (mean 1.588 Å) than those to bridging O atoms (1.621 Å). The total mean Si—O bond in Cs₂SnSi₆O₁₅ has a value of 1.613 Å, which is slightly shorter than the overall mean of 1.625 (24) calculated from 9128 bonds (Gagné & Hawthorne, 2018). The connectedness of the SiO₄ tetrahedra leads to the formation of a {Si₆O₁₅}^6– layer comprising five- and eight-membered rings (Fig. 2). The same type of silicate layer is found in the mineral zeravshanite with composition (Cs_3.80Na_0.18K_0.02)Na₂(Zr_2.73Ti_0.19Sn_0.04Fe_0.04)(Si₁₈O₄₅)(H₂O)₂ (Uvarova et al., 2004 ).

Figure 2
The {Si₆O₁₅}^6– layer in the crystal structure of Cs₂SnSi₆O₁₅ shown in a projection along [ $[\overline{1}]$ 0 $[\overline{2}]$ ]. Colour code and displacement ellipsoids are as in Fig.1.

Crystal-chemical features of silicates comprising the {Si₆O₁₅}^6– anion were recently compiled by Wierzbicka-Wieczorek et al. (2015 ). A topological classification of zirconosilicates and their analogues, where the simplest structure units are [MO₆] octahedra and TO₄ tetrahedra united by vertices, was reported some time ago by Ilyushin & Blatov (2002 ). Since the same structure elements are also present in Cs₂SnSi₆O₁₅ in the form of [SnO₆] octahedra and SiO₄ tetrahedra, a similar analysis can be made. With respect to the concept of the polyhedral microensemble (PME) introduced by Ilyushin & Blatov (2002), Cs₂SnSi₆O₁₅ conforms to the PME type C-1. A comparison of the unit-cell parameters of Cs₂SnSi₆O₁₅ with those of the other reported Cs₂M^IVSi₆O₁₅ (M^IV = Ti, Zr, Th, U) compounds (Table 1) revealed a close relationship between the Sn- and Zr-containing phases. The a and b axes and the β angle in the two structures are very similar, and the c axis of the Sn-containing compound is doubled. Indeed, there is a group–subgroup relationship between the crystal structures of Cs₂ZrSi₆O₁₅ and Cs₂SnSi₆O₁₅. The Sn-containing phase crystallizes in a subgroup (I2/c; Z = 12) of the Zr-containing phase (C2/m; Z = 6), defining a klassengleiche relationship of index 2 (Müller, 2013 ).

Table 1
Crystal data (Å, °) of Cs₂M^IVSi₆O₁₅ compounds

M	Ti (single-crystal data)^a	Ti (powder data)^b	Zr^c	Th (173 K data)^d	Th (293 K data)^e	U^f
Space group	C2/c	Cc	C2/m	Pca2₁	Cmc2₁	Cmc2₁
Z	4	4	6	4	4	4
a	13.386 (5)	12.988 (2)	26.610 (10)	16.2920 (10)	7.2813 (15)	7.2717 (3)
b	7.423 (3)	7.5014 (3)	7.506 (2)	7.2154 (6)	16.420 (3)	16.3061 (7)
c	15.134 (5)	15.156 (3)	11.602 (4)	13.6800 (10)	13.591 (3)	13.4983 (6)
β	107.71 (3)	105.80 (3)	107.43 (2)	90	90	90
V	1432.51	1420.83	2210.92	1608.13	1624.92	1600.53
References: (a) Grey et al. (1997 ); (b) Nyman et al. (2000 ); (c) Jolicart et al. (1996); (d) Woodward et al. (2005 ); (e) Mann et al. (2015 ); (f) Liu & Lii (2011 ).

3. Synthesis and crystallization

1.2 mmol of CaO (0.067 g), 0.13 mmol SnO (0.018 g) and 1.3 mmol of TeO₂ (0.207 g) were intimately mixed with 1 g of an NaCl (35 mol%):CsCl (65 mol%) mixture and filled in a silica ampoule that was subsequently evacuated and torch-sealed. The ampoule was then heated at 923 K for 2 d before the power of the furnace was switched off. The silica ampoule showed a severe attack from the halide flux but was still intact. After washing the recrystallized flux with several portions of warm water and drying the remaining solid in air, a few lath-shaped crystals of the title compound could be isolated under a polarizing microscope. Single-crystal diffraction of other selected crystals revealed α-CaTeO₃ (Stöger et al., 2009), CaTe₂O₅ (Weil & Stöger, 2008 ) and Ca₄Te₅O₁₄ (Weil, 2004 ) as products. Powder X-ray diffraction of the bulk showed the reflections of these phases together with those of SnO₂ and also some reflections of non-assignable phase(s).

4. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2. For better comparison of Cs₂SnSi₆O₁₅ with the crystal structure of Cs₂ZrSi₆O₁₅, the unconventional setting I2/c of space group type C2/c (No. 15) was chosen, so that unit-cell parameters a, b, c and β of the Sn-containing phase correspond to a, b, 2c and β of the Zr-containing phase (Jolicart et al., 1996 ; Table 1). The Cs3 atom in Cs₂SnSi₆O₁₅ was found to be disordered over two sites in a 0.934 (5):0.066 ratio and was refined with common displacement parameters for the two sites (A and B).

Table 2
Experimental details

Crystal data
Chemical formula	Cs₂SnSi₆O₁₅
M_r	793.05
Crystal system, space group	Monoclinic, I2/c
Temperature (K)	296
a, b, c (Å)	26.3434 (10), 7.4805 (3), 22.9137 (7)
β (°)	107.4020 (7)
V (Å³)	4308.7 (3)
Z	12
Radiation type	Mo Kα
μ (mm⁻¹)	7.36
Crystal size (mm)	0.12 × 0.03 × 0.01

Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Krause et al., 2015 ).
T_min, T_max	0.539, 0.747
No. of measured, independent and observed [I > 2σ(I)] reflections	51032, 8282, 5013
R_int	0.077
(sin θ/λ)_max (Å⁻¹)	0.772

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.037, 0.082, 1.00
No. of reflections	8282
No. of parameters	331
Δρ_max, Δρ_min (e Å⁻³)	1.84, −1.48
Computer programs: APEX3 and SAINT (Bruker, 2018 ), SHELXT (Sheldrick, 2015a ), SHELXL2018/3 (Sheldrick, 2015b ), ATOMS (Dowty, 2006 ) and publCIF (Westrip, 2010 ).

Supporting information

CCDC reference: 2130669

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989021013554/pk2660sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989021013554/pk2660Isup2.hkl

checkCIF report

Computing details top

Data collection: APEX3 (Bruker, 2018); cell refinement: SAINT (Bruker, 2018); data reduction: SAINT (Bruker, 2018); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2018/3 (Sheldrick, 2015b); molecular graphics: ATOMS (Dowty, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).

Dicaesium tin(IV) hexasilicate top

Crystal data top

Cs₂SnSi₆O₁₅	F(000) = 4368
M_r = 793.05	D_x = 3.668 Mg m⁻³
Monoclinic, I2/c	Mo Kα radiation, λ = 0.71073 Å
a = 26.3434 (10) Å	Cell parameters from 4399 reflections
b = 7.4805 (3) Å	θ = 2.8–32.4°
c = 22.9137 (7) Å	µ = 7.36 mm⁻¹
β = 107.4020 (7)°	T = 296 K
V = 4308.7 (3) Å³	Lath, colourless
Z = 12	0.12 × 0.03 × 0.01 mm

Data collection top

Bruker APEXII CCD diffractometer	5013 reflections with I > 2σ(I)
ω– and φ–scans	R_int = 0.077
Absorption correction: multi-scan (SADABS; Krause et al., 2015).	θ_max = 33.3°, θ_min = 2.8°
T_min = 0.539, T_max = 0.747	h = −40→40
51032 measured reflections	k = −11→11
8282 independent reflections	l = −35→35

Refinement top

Refinement on F²	331 parameters
Least-squares matrix: full	0 restraints
R[F² > 2σ(F²)] = 0.037	w = 1/[σ²(F_o²) + (0.0259P)²] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.082	(Δ/σ)_max = 0.002
S = 1.00	Δρ_max = 1.84 e Å⁻³
8282 reflections	Δρ_min = −1.48 e Å⁻³

Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Cs1	0.39755 (2)	−0.01953 (4)	0.18693 (2)	0.01982 (7)
Cs2	0.57484 (2)	−0.51580 (4)	0.00767 (2)	0.02128 (7)
Cs3A	0.74609 (2)	−0.98408 (7)	0.32160 (8)	0.02213 (18)	0.934 (5)
Cs3B	0.7514 (3)	−0.9776 (11)	0.3439 (8)	0.02213 (18)	0.066 (5)
Sn1	0.67822 (2)	−0.49735 (4)	−0.17784 (2)	0.00700 (6)
Sn2	0.500000	0.000000	0.000000	0.00681 (7)
Si1	0.62500 (5)	−0.70216 (15)	0.18853 (6)	0.0075 (2)
Si2	0.63425 (5)	−0.30679 (15)	0.18719 (6)	0.0091 (2)
Si3	0.69676 (5)	−0.70648 (15)	−0.04744 (6)	0.0077 (2)
Si4	0.63589 (4)	−0.99872 (15)	−0.00070 (5)	0.0067 (2)
Si5	0.81053 (5)	−0.81223 (15)	0.04445 (6)	0.0086 (2)
Si6	0.68624 (4)	−0.99635 (15)	0.13636 (5)	0.0078 (2)
Si7	0.50782 (5)	−0.80838 (15)	0.13301 (6)	0.0080 (2)
Si8	0.51736 (5)	−0.20099 (15)	0.13222 (6)	0.0081 (2)
Si9	0.45804 (4)	−0.50114 (15)	0.18261 (5)	0.0066 (2)
O1	0.65897 (13)	−0.7024 (4)	0.25901 (15)	0.0129 (7)
O2	0.56382 (13)	−0.7463 (4)	0.18108 (15)	0.0167 (7)
O3	0.64737 (13)	−0.8469 (4)	0.15066 (16)	0.0199 (8)
O4	0.62794 (13)	−0.5077 (4)	0.15681 (13)	0.0140 (6)
O5	0.66980 (12)	−0.3096 (4)	0.25683 (15)	0.0115 (6)
O6	0.66307 (13)	−0.1918 (4)	0.14653 (15)	0.0162 (7)
O7	0.57564 (13)	−0.2302 (4)	0.18125 (15)	0.0170 (7)
O8	0.70020 (13)	−0.6982 (4)	−0.11572 (15)	0.0119 (7)
O9	0.75309 (13)	−0.7544 (5)	0.00067 (17)	0.0187 (7)
O10	0.65155 (12)	−0.8509 (4)	−0.04422 (15)	0.0134 (7)
O11	0.67790 (13)	−0.5157 (4)	−0.02671 (14)	0.0144 (6)
O12	0.57747 (12)	−0.9680 (4)	0.00220 (15)	0.0144 (7)
O13	0.68113 (12)	−0.9797 (4)	0.06475 (13)	0.0123 (6)
O14	0.85664 (13)	−0.6934 (4)	0.02893 (16)	0.0147 (7)
O15	0.81334 (13)	−0.7987 (4)	0.11477 (14)	0.0125 (7)
O16	0.74525 (12)	−0.9636 (4)	0.17887 (14)	0.0136 (7)
O17	0.50824 (13)	−0.7996 (4)	0.06370 (15)	0.0127 (7)
O18	0.46185 (12)	−0.6903 (4)	0.14849 (15)	0.0129 (7)
O19	0.49642 (12)	−0.0117 (4)	0.15154 (14)	0.0119 (6)
O20	0.51978 (13)	−0.1991 (4)	0.06375 (15)	0.0121 (7)
O21	0.47656 (13)	−0.3514 (4)	0.14152 (16)	0.0171 (7)
O22	0.39930 (12)	−0.4614 (4)	0.18260 (15)	0.0149 (7)
O23	0.500000	−0.5021 (6)	0.250000	0.0193 (10)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cs1	0.01741 (15)	0.02075 (15)	0.02457 (17)	−0.00118 (12)	0.01126 (13)	−0.00080 (13)
Cs2	0.01832 (15)	0.02304 (15)	0.02465 (17)	−0.00150 (14)	0.00974 (13)	−0.00107 (14)
Cs3A	0.01454 (17)	0.02048 (16)	0.0320 (5)	0.00139 (14)	0.0080 (2)	0.0013 (2)
Cs3B	0.01454 (17)	0.02048 (16)	0.0320 (5)	0.00139 (14)	0.0080 (2)	0.0013 (2)
Sn1	0.00705 (12)	0.00726 (12)	0.00620 (13)	0.00027 (11)	0.00124 (10)	0.00007 (12)
Sn2	0.00707 (17)	0.00700 (17)	0.00653 (18)	0.00038 (16)	0.00229 (14)	0.00016 (17)
Si1	0.0074 (6)	0.0074 (5)	0.0069 (6)	−0.0006 (4)	0.0011 (5)	−0.0018 (4)
Si2	0.0098 (6)	0.0086 (5)	0.0082 (7)	−0.0011 (4)	0.0013 (5)	0.0012 (4)
Si3	0.0086 (6)	0.0076 (5)	0.0064 (7)	0.0007 (4)	0.0016 (5)	0.0012 (4)
Si4	0.0063 (5)	0.0065 (5)	0.0079 (5)	−0.0005 (4)	0.0031 (4)	0.0001 (5)
Si5	0.0093 (6)	0.0071 (5)	0.0091 (7)	0.0004 (4)	0.0021 (5)	0.0010 (4)
Si6	0.0077 (5)	0.0091 (5)	0.0065 (5)	0.0003 (5)	0.0020 (4)	−0.0002 (5)
Si7	0.0086 (6)	0.0063 (5)	0.0091 (7)	−0.0002 (4)	0.0025 (5)	−0.0012 (4)
Si8	0.0089 (6)	0.0072 (5)	0.0086 (7)	0.0011 (4)	0.0031 (5)	0.0020 (4)
Si9	0.0068 (5)	0.0064 (5)	0.0071 (5)	−0.0012 (5)	0.0029 (4)	−0.0004 (5)
O1	0.0160 (17)	0.0111 (15)	0.0096 (18)	0.0011 (12)	0.0008 (14)	−0.0006 (12)
O2	0.0086 (16)	0.0259 (18)	0.0147 (19)	−0.0032 (13)	0.0020 (14)	−0.0048 (14)
O3	0.0168 (18)	0.0198 (17)	0.022 (2)	0.0065 (14)	0.0036 (16)	−0.0121 (14)
O4	0.0229 (17)	0.0077 (13)	0.0097 (15)	−0.0037 (13)	0.0026 (13)	−0.0007 (12)
O5	0.0119 (16)	0.0099 (14)	0.0110 (18)	−0.0009 (12)	0.0011 (14)	0.0037 (12)
O6	0.0219 (19)	0.0129 (15)	0.0154 (19)	−0.0034 (13)	0.0079 (16)	0.0028 (13)
O7	0.0102 (17)	0.0242 (18)	0.0131 (19)	0.0048 (13)	−0.0019 (14)	0.0041 (14)
O8	0.0164 (17)	0.0092 (14)	0.0105 (18)	0.0016 (12)	0.0049 (14)	0.0024 (12)
O9	0.0121 (16)	0.0264 (17)	0.0146 (17)	0.0030 (13)	−0.0005 (13)	0.0072 (13)
O10	0.0129 (17)	0.0145 (15)	0.0105 (17)	−0.0063 (12)	0.0001 (14)	0.0045 (12)
O11	0.0209 (17)	0.0096 (14)	0.0175 (17)	−0.0002 (13)	0.0131 (14)	−0.0014 (13)
O12	0.0071 (15)	0.0177 (15)	0.0203 (18)	−0.0010 (12)	0.0068 (13)	−0.0010 (13)
O13	0.0134 (15)	0.0193 (16)	0.0030 (14)	−0.0020 (13)	0.0006 (12)	0.0005 (12)
O14	0.0124 (17)	0.0131 (15)	0.018 (2)	−0.0025 (12)	0.0042 (15)	0.0036 (13)
O15	0.0196 (18)	0.0097 (14)	0.0070 (17)	0.0016 (12)	0.0022 (14)	0.0007 (12)
O16	0.0083 (15)	0.0237 (17)	0.0081 (16)	−0.0012 (12)	0.0013 (12)	−0.0024 (13)
O17	0.0195 (18)	0.0111 (14)	0.0072 (18)	−0.0012 (13)	0.0036 (14)	−0.0039 (12)
O18	0.0117 (16)	0.0096 (14)	0.0178 (19)	0.0030 (12)	0.0052 (14)	−0.0048 (12)
O19	0.0146 (15)	0.0106 (14)	0.0132 (15)	0.0011 (13)	0.0084 (13)	0.0002 (13)
O20	0.0162 (17)	0.0106 (14)	0.0107 (18)	0.0033 (12)	0.0060 (14)	0.0009 (12)
O21	0.0201 (19)	0.0143 (16)	0.017 (2)	−0.0077 (13)	0.0064 (16)	0.0061 (13)
O22	0.0081 (15)	0.0155 (15)	0.0211 (18)	0.0013 (12)	0.0042 (14)	−0.0025 (13)
O23	0.020 (2)	0.025 (2)	0.011 (2)	0.000	0.0024 (19)	0.000

Geometric parameters (Å, º) top

Cs1—O19	2.951 (3)	Sn1—O22ⁱⁱⁱ	2.036 (3)
Cs1—O1ⁱ	3.237 (3)	Sn1—O1^x	2.036 (3)
Cs1—O18ⁱⁱ	3.256 (3)	Sn1—O15^vi	2.038 (3)
Cs1—O10ⁱⁱⁱ	3.282 (3)	Sn1—O16^vi	2.039 (3)
Cs1—O7^iv	3.291 (3)	Sn1—O5^x	2.044 (3)
Cs1—O5^iv	3.299 (3)	Sn2—O12ⁱⁱⁱ	2.040 (3)
Cs1—O22	3.308 (3)	Sn2—O12ⁱⁱ	2.040 (3)
Cs1—O15^v	3.336 (3)	Sn2—O20	2.042 (3)
Cs1—O8ⁱⁱⁱ	3.352 (3)	Sn2—O20^xi	2.042 (3)
Cs1—O2ⁱ	3.538 (3)	Sn2—O17ⁱⁱⁱ	2.058 (3)
Cs1—O21	3.588 (3)	Sn2—O17ⁱⁱ	2.058 (3)
Cs1—Cs3Aⁱ	3.7396 (5)	Si1—O1	1.595 (4)
Cs2—O11	3.045 (3)	Si1—O2	1.604 (3)
Cs2—O20	3.238 (3)	Si1—O3	1.606 (3)
Cs2—O17	3.253 (3)	Si1—O4	1.638 (3)
Cs2—O14^vi	3.268 (3)	Si2—O5	1.590 (3)
Cs2—O4	3.283 (3)	Si2—O7	1.614 (3)
Cs2—O17ⁱⁱⁱ	3.300 (3)	Si2—O6	1.615 (3)
Cs2—O20ⁱⁱⁱ	3.316 (3)	Si2—O4	1.644 (3)
Cs2—O12	3.387 (3)	Si3—O8	1.595 (3)
Cs2—O21ⁱⁱⁱ	3.426 (4)	Si3—O9	1.602 (4)
Cs2—O10	3.636 (3)	Si3—O10	1.626 (3)
Cs2—O18ⁱⁱⁱ	3.748 (3)	Si3—O11	1.628 (3)
Cs2—Cs2ⁱⁱⁱ	3.8598 (6)	Si4—O12	1.577 (3)
Cs3A—O1	3.129 (3)	Si4—O13	1.619 (3)
Cs3A—O8^vii	3.195 (3)	Si4—O10	1.623 (3)
Cs3A—O4^viii	3.206 (3)	Si4—O14^xii	1.629 (3)
Cs3A—O5^ix	3.223 (3)	Si5—O15	1.594 (3)
Cs3A—O15^viii	3.227 (3)	Si5—O9	1.605 (4)
Cs3A—O16	3.268 (3)	Si5—O11^xii	1.628 (3)
Cs3A—O6^viii	3.331 (3)	Si5—O14	1.628 (3)
Cs3A—O16^viii	3.357 (3)	Si6—O16	1.587 (3)
Cs3A—Si2^viii	3.5783 (13)	Si6—O13	1.611 (3)
Cs3A—O5^viii	3.592 (3)	Si6—O3	1.615 (3)
Cs3A—O3^viii	3.653 (3)	Si6—O6^ix	1.628 (3)
Cs3B—O15^viii	3.007 (10)	Si7—O17	1.593 (3)
Cs3B—O8^vii	3.050 (9)	Si7—O18	1.622 (3)
Cs3B—O4^viii	3.186 (8)	Si7—O2	1.623 (4)
Cs3B—O6^viii	3.308 (8)	Si7—O19^ix	1.631 (3)
Cs3B—O1	3.334 (12)	Si8—O20	1.589 (3)
Cs3B—O16^viii	3.347 (9)	Si8—O21	1.614 (3)
Cs3B—O5^ix	3.494 (13)	Si8—O7	1.623 (4)
Cs3B—O3^viii	3.580 (8)	Si8—O19	1.629 (3)
Cs3B—Si2^viii	3.670 (8)	Si9—O22	1.576 (3)
Cs3B—O16	3.738 (18)	Si9—O23	1.6078 (12)
Cs3B—Si1^viii	3.796 (8)	Si9—O21	1.629 (3)
Sn1—O8	2.031 (3)	Si9—O18	1.634 (3)

O19—Cs1—O1ⁱ	129.44 (8)	O1—Si1—Cs3A^viii	79.54 (12)
O19—Cs1—O18ⁱⁱ	48.50 (7)	O2—Si1—Cs3A^viii	166.44 (14)
O1ⁱ—Cs1—O18ⁱⁱ	83.41 (7)	O3—Si1—Cs3A^viii	74.38 (13)
O19—Cs1—O10ⁱⁱⁱ	81.34 (8)	O4—Si1—Cs3A^viii	58.51 (12)
O1ⁱ—Cs1—O10ⁱⁱⁱ	120.55 (8)	O1—Si1—Cs3B^viii	86.8 (3)
O18ⁱⁱ—Cs1—O10ⁱⁱⁱ	92.05 (8)	O2—Si1—Cs3B^viii	161.0 (3)
O19—Cs1—O7^iv	107.28 (8)	O3—Si1—Cs3B^viii	70.0 (2)
O1ⁱ—Cs1—O7^iv	89.80 (8)	O4—Si1—Cs3B^viii	56.05 (18)
O18ⁱⁱ—Cs1—O7^iv	128.63 (8)	Cs3A^viii—Si1—Cs3B^viii	7.4 (2)
O10ⁱⁱⁱ—Cs1—O7^iv	133.27 (8)	O1—Si1—Cs1^xiii	54.50 (11)
O19—Cs1—O5^iv	137.94 (8)	O2—Si1—Cs1^xiii	65.38 (13)
O1ⁱ—Cs1—O5^iv	88.26 (7)	O3—Si1—Cs1^xiii	98.41 (13)
O18ⁱⁱ—Cs1—O5^iv	170.79 (7)	O4—Si1—Cs1^xiii	154.79 (12)
O10ⁱⁱⁱ—Cs1—O5^iv	95.58 (7)	Cs3A^viii—Si1—Cs1^xiii	127.81 (4)
O7^iv—Cs1—O5^iv	47.11 (8)	Cs3B^viii—Si1—Cs1^xiii	133.4 (2)
O19—Cs1—O22	89.45 (8)	O1—Si1—Cs2	156.41 (12)
O1ⁱ—Cs1—O22	139.09 (7)	O2—Si1—Cs2	87.35 (13)
O18ⁱⁱ—Cs1—O22	137.29 (7)	O3—Si1—Cs2	75.41 (14)
O10ⁱⁱⁱ—Cs1—O22	71.33 (8)	O4—Si1—Cs2	46.31 (11)
O7^iv—Cs1—O22	63.12 (8)	Cs3A^viii—Si1—Cs2	80.71 (3)
O5^iv—Cs1—O22	50.83 (7)	Cs3B^viii—Si1—Cs2	74.0 (3)
O19—Cs1—O15^v	111.12 (8)	Cs1^xiii—Si1—Cs2	148.79 (3)
O1ⁱ—Cs1—O15^v	49.69 (8)	O1—Si1—Cs3A	36.91 (11)
O18ⁱⁱ—Cs1—O15^v	69.44 (7)	O2—Si1—Cs3A	119.24 (13)
O10ⁱⁱⁱ—Cs1—O15^v	73.23 (8)	O3—Si1—Cs3A	74.66 (14)
O7^iv—Cs1—O15^v	136.47 (7)	O4—Si1—Cs3A	129.29 (12)
O5^iv—Cs1—O15^v	107.90 (7)	Cs3A^viii—Si1—Cs3A	74.28 (3)
O22—Cs1—O15^v	135.35 (8)	Cs3B^viii—Si1—Cs3A	79.2 (2)
O19—Cs1—O8ⁱⁱⁱ	119.44 (8)	Cs1^xiii—Si1—Cs3A	54.428 (19)
O1ⁱ—Cs1—O8ⁱⁱⁱ	105.87 (7)	Cs2—Si1—Cs3A	145.09 (3)
O18ⁱⁱ—Cs1—O8ⁱⁱⁱ	136.95 (8)	O5—Si2—O7	110.53 (17)
O10ⁱⁱⁱ—Cs1—O8ⁱⁱⁱ	46.58 (7)	O5—Si2—O6	110.39 (18)
O7^iv—Cs1—O8ⁱⁱⁱ	93.90 (8)	O7—Si2—O6	111.42 (18)
O5^iv—Cs1—O8ⁱⁱⁱ	49.56 (8)	O5—Si2—O4	111.56 (16)
O22—Cs1—O8ⁱⁱⁱ	51.07 (7)	O7—Si2—O4	108.41 (18)
O15^v—Cs1—O8ⁱⁱⁱ	84.72 (7)	O6—Si2—O4	104.37 (16)
O19—Cs1—O2ⁱ	99.87 (8)	O5—Si2—Cs3A^viii	77.67 (12)
O1ⁱ—Cs1—O2ⁱ	45.36 (8)	O7—Si2—Cs3A^viii	170.77 (14)
O18ⁱⁱ—Cs1—O2ⁱ	75.78 (8)	O6—Si2—Cs3A^viii	68.05 (12)
O10ⁱⁱⁱ—Cs1—O2ⁱ	161.62 (7)	O4—Si2—Cs3A^viii	63.62 (12)
O7^iv—Cs1—O2ⁱ	64.15 (7)	O5—Si2—Cs3B^viii	85.3 (3)
O5^iv—Cs1—O2ⁱ	95.55 (7)	O7—Si2—Cs3B^viii	163.7 (3)
O22—Cs1—O2ⁱ	126.86 (8)	O6—Si2—Cs3B^viii	64.3 (2)
O15^v—Cs1—O2ⁱ	89.43 (7)	O4—Si2—Cs3B^viii	60.1 (2)
O8ⁱⁱⁱ—Cs1—O2ⁱ	139.69 (7)	Cs3A^viii—Si2—Cs3B^viii	7.6 (3)
O19—Cs1—O21	45.41 (7)	O5—Si2—Cs1^iv	56.99 (11)
O1ⁱ—Cs1—O21	172.30 (8)	O7—Si2—Cs1^iv	56.83 (13)
O18ⁱⁱ—Cs1—O21	92.93 (7)	O6—Si2—Cs1^iv	112.15 (12)
O10ⁱⁱⁱ—Cs1—O21	66.22 (8)	O4—Si2—Cs1^iv	143.45 (12)
O7^iv—Cs1—O21	87.19 (8)	Cs3A^viii—Si2—Cs1^iv	132.30 (5)
O5^iv—Cs1—O21	94.85 (7)	Cs3B^viii—Si2—Cs1^iv	139.4 (3)
O22—Cs1—O21	44.39 (7)	O5—Si2—Cs2	154.76 (12)
O15^v—Cs1—O21	135.03 (8)	O7—Si2—Cs2	89.01 (13)
O8ⁱⁱⁱ—Cs1—O21	81.42 (7)	O6—Si2—Cs2	74.77 (13)
O2ⁱ—Cs1—O21	127.16 (8)	O4—Si2—Cs2	44.80 (11)
O19—Cs1—Cs3Aⁱ	161.21 (7)	Cs3A^viii—Si2—Cs2	81.95 (4)
O1ⁱ—Cs1—Cs3Aⁱ	52.70 (6)	Cs3B^viii—Si2—Cs2	74.7 (3)
O18ⁱⁱ—Cs1—Cs3Aⁱ	122.16 (5)	Cs1^iv—Si2—Cs2	145.67 (4)
O10ⁱⁱⁱ—Cs1—Cs3Aⁱ	82.98 (6)	O5—Si2—Cs3Aⁱⁱ	38.62 (11)
O7^iv—Cs1—Cs3Aⁱ	91.03 (6)	O7—Si2—Cs3Aⁱⁱ	107.08 (13)
O5^iv—Cs1—Cs3Aⁱ	54.06 (6)	O6—Si2—Cs3Aⁱⁱ	77.00 (13)
O22—Cs1—Cs3Aⁱ	95.29 (5)	O4—Si2—Cs3Aⁱⁱ	140.89 (12)
O15^v—Cs1—Cs3Aⁱ	53.91 (5)	Cs3A^viii—Si2—Cs3Aⁱⁱ	81.93 (4)
O8ⁱⁱⁱ—Cs1—Cs3Aⁱ	53.22 (5)	Cs3B^viii—Si2—Cs3Aⁱⁱ	87.7 (2)
O2ⁱ—Cs1—Cs3Aⁱ	91.81 (5)	Cs1^iv—Si2—Cs3Aⁱⁱ	54.01 (2)
O21—Cs1—Cs3Aⁱ	134.39 (5)	Cs2—Si2—Cs3Aⁱⁱ	151.10 (3)
O11—Cs2—O20	129.98 (8)	O8—Si3—O9	111.77 (18)
O11—Cs2—O17	136.90 (8)	O8—Si3—O10	109.12 (18)
O20—Cs2—O17	87.84 (7)	O9—Si3—O10	111.11 (18)
O11—Cs2—O14^vi	47.93 (7)	O8—Si3—O11	111.35 (16)
O20—Cs2—O14^vi	84.79 (7)	O9—Si3—O11	107.22 (19)
O17—Cs2—O14^vi	170.85 (8)	O10—Si3—O11	106.12 (16)
O11—Cs2—O4	97.70 (8)	O8—Si3—Cs1ⁱⁱⁱ	55.75 (12)
O20—Cs2—O4	71.06 (8)	O9—Si3—Cs1ⁱⁱⁱ	131.64 (14)
O17—Cs2—O4	73.34 (8)	O10—Si3—Cs1ⁱⁱⁱ	53.45 (12)
O14^vi—Cs2—O4	99.06 (8)	O11—Si3—Cs1ⁱⁱⁱ	120.94 (13)
O11—Cs2—O17ⁱⁱⁱ	112.47 (8)	O8—Si3—Cs3B^xiv	43.6 (2)
O20—Cs2—O17ⁱⁱⁱ	50.51 (7)	O9—Si3—Cs3B^xiv	82.2 (2)
O17—Cs2—O17ⁱⁱⁱ	107.82 (6)	O10—Si3—Cs3B^xiv	92.32 (16)
O14^vi—Cs2—O17ⁱⁱⁱ	71.38 (8)	O11—Si3—Cs3B^xiv	153.9 (2)
O4—Cs2—O17ⁱⁱⁱ	121.04 (7)	Cs1ⁱⁱⁱ—Si3—Cs3B^xiv	56.65 (16)
O11—Cs2—O20ⁱⁱⁱ	117.98 (7)	O8—Si3—Cs2	125.15 (13)
O20—Cs2—O20ⁱⁱⁱ	107.85 (6)	O9—Si3—Cs2	121.49 (14)
O17—Cs2—O20ⁱⁱⁱ	50.25 (7)	O10—Si3—Cs2	63.86 (12)
O14^vi—Cs2—O20ⁱⁱⁱ	137.65 (8)	O11—Si3—Cs2	42.26 (11)
O4—Cs2—O20ⁱⁱⁱ	123.29 (7)	Cs1ⁱⁱⁱ—Si3—Cs2	93.96 (3)
O17ⁱⁱⁱ—Cs2—O20ⁱⁱⁱ	85.76 (7)	Cs3B^xiv—Si3—Cs2	150.41 (15)
O11—Cs2—O12	87.76 (7)	O8—Si3—Cs3A^xiv	38.41 (11)
O20—Cs2—O12	139.65 (7)	O9—Si3—Cs3A^xiv	87.05 (14)
O17—Cs2—O12	51.84 (7)	O10—Si3—Cs3A^xiv	93.01 (12)
O14^vi—Cs2—O12	135.12 (7)	O11—Si3—Cs3A^xiv	149.35 (12)
O4—Cs2—O12	92.86 (8)	Cs1ⁱⁱⁱ—Si3—Cs3A^xiv	53.629 (19)
O17ⁱⁱⁱ—Cs2—O12	135.53 (8)	Cs3B^xiv—Si3—Cs3A^xiv	5.5 (2)
O20ⁱⁱⁱ—Cs2—O12	50.21 (7)	Cs2—Si3—Cs3A^xiv	147.54 (4)
O11—Cs2—O21ⁱⁱⁱ	81.88 (8)	O12—Si4—O13	113.92 (17)
O20—Cs2—O21ⁱⁱⁱ	121.19 (8)	O12—Si4—O10	110.94 (17)
O17—Cs2—O21ⁱⁱⁱ	96.07 (7)	O13—Si4—O10	104.91 (17)
O14^vi—Cs2—O21ⁱⁱⁱ	92.39 (8)	O12—Si4—O14^xii	112.47 (17)
O4—Cs2—O21ⁱⁱⁱ	164.18 (7)	O13—Si4—O14^xii	107.67 (17)
O17ⁱⁱⁱ—Cs2—O21ⁱⁱⁱ	72.97 (8)	O10—Si4—O14^xii	106.39 (17)
O20ⁱⁱⁱ—Cs2—O21ⁱⁱⁱ	46.12 (7)	O12—Si4—Cs2	56.81 (11)
O12—Cs2—O21ⁱⁱⁱ	71.33 (8)	O13—Si4—Cs2	94.11 (11)
O11—Cs2—O10	44.74 (7)	O10—Si4—Cs2	65.92 (11)
O20—Cs2—O10	173.27 (8)	O14^xii—Si4—Cs2	158.21 (14)
O17—Cs2—O10	95.59 (7)	O12—Si4—Cs1ⁱⁱⁱ	97.51 (13)
O14^vi—Cs2—O10	91.21 (7)	O13—Si4—Cs1ⁱⁱⁱ	146.31 (11)
O4—Cs2—O10	104.34 (7)	O10—Si4—Cs1ⁱⁱⁱ	49.59 (12)
O17ⁱⁱⁱ—Cs2—O10	133.00 (7)	O14^xii—Si4—Cs1ⁱⁱⁱ	68.28 (12)
O20ⁱⁱⁱ—Cs2—O10	78.73 (7)	Cs2—Si4—Cs1ⁱⁱⁱ	93.20 (2)
O12—Cs2—O10	43.92 (6)	O12—Si4—Cs2^ix	75.01 (11)
O21ⁱⁱⁱ—Cs2—O10	64.29 (8)	O13—Si4—Cs2^ix	102.93 (11)
O11—Cs2—O18ⁱⁱⁱ	75.42 (8)	O10—Si4—Cs2^ix	145.47 (12)
O20—Cs2—O18ⁱⁱⁱ	93.42 (7)	O14^xii—Si4—Cs2^ix	44.83 (11)
O17—Cs2—O18ⁱⁱⁱ	129.03 (8)	Cs2—Si4—Cs2^ix	131.69 (3)
O14^vi—Cs2—O18ⁱⁱⁱ	57.05 (8)	Cs1ⁱⁱⁱ—Si4—Cs2^ix	96.43 (2)
O4—Cs2—O18ⁱⁱⁱ	153.40 (7)	O15—Si5—O9	111.40 (18)
O17ⁱⁱⁱ—Cs2—O18ⁱⁱⁱ	44.71 (7)	O15—Si5—O11^xii	110.88 (16)
O20ⁱⁱⁱ—Cs2—O18ⁱⁱⁱ	81.50 (7)	O9—Si5—O11^xii	107.93 (19)
O12—Cs2—O18ⁱⁱⁱ	112.20 (7)	O15—Si5—O14	111.96 (18)
O21ⁱⁱⁱ—Cs2—O18ⁱⁱⁱ	41.79 (7)	O9—Si5—O14	110.00 (18)
O10—Cs2—O18ⁱⁱⁱ	88.92 (6)	O11^xii—Si5—O14	104.38 (16)
O11—Cs2—Cs2ⁱⁱⁱ	160.41 (6)	O15—Si5—Cs2^xii	122.11 (13)
O20—Cs2—Cs2ⁱⁱⁱ	54.87 (6)	O9—Si5—Cs2^xii	126.10 (14)
O17—Cs2—Cs2ⁱⁱⁱ	54.48 (6)	O11^xii—Si5—Cs2^xii	48.26 (11)
O14^vi—Cs2—Cs2ⁱⁱⁱ	123.98 (6)	O14—Si5—Cs2^xii	56.37 (11)
O4—Cs2—Cs2ⁱⁱⁱ	101.49 (5)	O15—Si5—Cs3B^viii	39.9 (2)
O17ⁱⁱⁱ—Cs2—Cs2ⁱⁱⁱ	53.35 (5)	O9—Si5—Cs3B^viii	76.6 (2)
O20ⁱⁱⁱ—Cs2—Cs2ⁱⁱⁱ	52.98 (5)	O11^xii—Si5—Cs3B^viii	143.06 (18)
O12—Cs2—Cs2ⁱⁱⁱ	95.13 (5)	O14—Si5—Cs3B^viii	108.28 (16)
O21ⁱⁱⁱ—Cs2—Cs2ⁱⁱⁱ	80.72 (5)	Cs2^xii—Si5—Cs3B^viii	154.58 (17)
O10—Cs2—Cs2ⁱⁱⁱ	131.69 (5)	O15—Si5—Cs1^xv	47.65 (11)
O18ⁱⁱⁱ—Cs2—Cs2ⁱⁱⁱ	85.59 (5)	O9—Si5—Cs1^xv	121.39 (14)
O1—Cs3A—O8^vii	112.49 (8)	O11^xii—Si5—Cs1^xv	130.40 (13)
O1—Cs3A—O4^viii	131.83 (8)	O14—Si5—Cs1^xv	64.99 (13)
O8^vii—Cs3A—O4^viii	115.45 (8)	Cs2^xii—Si5—Cs1^xv	100.22 (3)
O1—Cs3A—O5^ix	91.53 (8)	Cs3B^viii—Si5—Cs1^xv	54.65 (16)
O8^vii—Cs3A—O5^ix	51.50 (8)	O16—Si6—O13	112.41 (16)
O4^viii—Cs3A—O5^ix	122.05 (8)	O16—Si6—O3	109.44 (18)
O1—Cs3A—O15^viii	51.50 (8)	O13—Si6—O3	106.76 (18)
O8^vii—Cs3A—O15^viii	89.11 (8)	O16—Si6—O6^ix	113.01 (18)
O4^viii—Cs3A—O15^viii	124.22 (9)	O13—Si6—O6^ix	107.14 (17)
O5^ix—Cs3A—O15^viii	112.54 (8)	O3—Si6—O6^ix	107.78 (18)
O1—Cs3A—O16	74.06 (8)	O16—Si6—Cs3B^viii	59.0 (2)
O8^vii—Cs3A—O16	126.48 (9)	O13—Si6—Cs3B^viii	87.2 (3)
O4^viii—Cs3A—O16	81.50 (8)	O3—Si6—Cs3B^viii	67.37 (17)
O5^ix—Cs3A—O16	75.98 (8)	O6^ix—Si6—Cs3B^viii	165.6 (3)
O15^viii—Cs3A—O16	124.23 (8)	O16—Si6—Cs3A^viii	55.21 (12)
O1—Cs3A—O6^viii	166.14 (10)	O13—Si6—Cs3A^viii	94.08 (11)
O8^vii—Cs3A—O6^viii	72.76 (8)	O3—Si6—Cs3A^viii	65.97 (13)
O4^viii—Cs3A—O6^viii	46.33 (7)	O6^ix—Si6—Cs3A^viii	158.73 (13)
O5^ix—Cs3A—O6^viii	81.91 (8)	Cs3B^viii—Si6—Cs3A^viii	6.9 (2)
O15^viii—Cs3A—O6^viii	142.36 (10)	O16—Si6—Cs3A	49.66 (11)
O16—Cs3A—O6^viii	92.45 (8)	O13—Si6—Cs3A	161.93 (12)
O1—Cs3A—O16^viii	50.82 (8)	O3—Si6—Cs3A	81.01 (14)
O8^vii—Cs3A—O16^viii	141.13 (8)	O6^ix—Si6—Cs3A	85.16 (13)
O4^viii—Cs3A—O16^viii	87.21 (7)	Cs3B^viii—Si6—Cs3A	80.7 (3)
O5^ix—Cs3A—O16^viii	141.80 (8)	Cs3A^viii—Si6—Cs3A	73.88 (3)
O15^viii—Cs3A—O16^viii	52.43 (7)	O16—Si6—Cs3B^xvi	78.5 (2)
O16—Cs3A—O16^viii	86.00 (8)	O13—Si6—Cs3B^xvi	95.3 (3)
O6^viii—Cs3A—O16^viii	132.99 (8)	O3—Si6—Cs3B^xvi	150.6 (2)
O1—Cs3A—Si2^viii	143.72 (7)	O6^ix—Si6—Cs3B^xvi	45.60 (15)
O8^vii—Cs3A—Si2^viii	99.10 (6)	Cs3B^viii—Si6—Cs3B^xvi	134.4 (2)
O4^viii—Cs3A—Si2^viii	27.34 (5)	Cs3A^viii—Si6—Cs3B^xvi	132.72 (14)
O5^ix—Cs3A—Si2^viii	94.72 (6)	Cs3A—Si6—Cs3B^xvi	83.8 (2)
O15^viii—Cs3A—Si2^viii	150.05 (8)	O16—Si6—Cs3A^xvi	74.65 (12)
O16—Cs3A—Si2^viii	72.93 (6)	O13—Si6—Cs3A^xvi	101.69 (12)
O6^viii—Cs3A—Si2^viii	26.72 (5)	O3—Si6—Cs3A^xvi	146.41 (14)
O16^viii—Cs3A—Si2^viii	111.97 (5)	O6^ix—Si6—Cs3A^xvi	45.44 (12)
O1—Cs3A—O5^viii	122.52 (9)	Cs3B^viii—Si6—Cs3A^xvi	132.32 (15)
O8^vii—Cs3A—O5^viii	106.15 (7)	Cs3A^viii—Si6—Cs3A^xvi	129.68 (4)
O4^viii—Cs3A—O5^viii	45.90 (7)	Cs3A—Si6—Cs3A^xvi	77.24 (3)
O5^ix—Cs3A—O5^viii	80.67 (8)	Cs3B^xvi—Si6—Cs3A^xvi	6.6 (2)
O15^viii—Cs3A—O5^viii	164.32 (7)	O17—Si7—O18	115.08 (18)
O16—Cs3A—O5^viii	48.69 (8)	O17—Si7—O2	112.90 (17)
O6^viii—Cs3A—O5^viii	44.49 (7)	O18—Si7—O2	106.40 (17)
O16^viii—Cs3A—O5^viii	111.99 (7)	O17—Si7—O19^ix	110.79 (16)
Si2^viii—Cs3A—O5^viii	25.63 (6)	O18—Si7—O19^ix	104.08 (15)
O1—Cs3A—O3^viii	92.49 (8)	O2—Si7—O19^ix	106.91 (18)
O8^vii—Cs3A—O3^viii	143.14 (10)	O17—Si7—Cs1^ix	124.89 (13)
O4^viii—Cs3A—O3^viii	43.96 (7)	O18—Si7—Cs1^ix	57.65 (11)
O5^ix—Cs3A—O3^viii	158.91 (8)	O2—Si7—Cs1^ix	121.55 (13)
O15^viii—Cs3A—O3^viii	85.90 (7)	O19^ix—Si7—Cs1^ix	46.64 (10)
O16—Cs3A—O3^viii	85.25 (8)	O17—Si7—Cs2ⁱⁱⁱ	49.62 (12)
O6^viii—Cs3A—O3^viii	89.48 (7)	O18—Si7—Cs2ⁱⁱⁱ	66.05 (12)
O16^viii—Cs3A—O3^viii	43.53 (7)	O2—Si7—Cs2ⁱⁱⁱ	121.72 (13)
Si2^viii—Cs3A—O3^viii	70.25 (5)	O19^ix—Si7—Cs2ⁱⁱⁱ	131.32 (13)
O5^viii—Cs3A—O3^viii	79.71 (7)	Cs1^ix—Si7—Cs2ⁱⁱⁱ	102.84 (3)
O1—Cs3A—Cs1^xiii	55.38 (6)	O20—Si8—O21	111.19 (18)
O8^vii—Cs3A—Cs1^xiii	57.17 (6)	O20—Si8—O7	112.06 (18)
O4^viii—Cs3A—Cs1^xiii	172.38 (6)	O21—Si8—O7	110.13 (18)
O5^ix—Cs3A—Cs1^xiii	55.98 (5)	O20—Si8—O19	112.18 (16)
O15^viii—Cs3A—Cs1^xiii	56.64 (6)	O21—Si8—O19	106.10 (17)
O16—Cs3A—Cs1^xiii	104.31 (6)	O7—Si8—O19	104.83 (18)
O6^viii—Cs3A—Cs1^xiii	127.54 (5)	O20—Si8—Cs1	125.41 (13)
O16^viii—Cs3A—Cs1^xiii	98.01 (5)	O21—Si8—Cs1	64.70 (12)
Si2^viii—Cs3A—Cs1^xiii	149.39 (3)	O7—Si8—Cs1	120.29 (13)
O5^viii—Cs3A—Cs1^xiii	135.18 (6)	O19—Si8—Cs1	41.45 (10)
O3^viii—Cs3A—Cs1^xiii	140.35 (5)	O20—Si8—Cs2ⁱⁱⁱ	53.68 (12)
O15^viii—Cs3B—O8^vii	96.1 (3)	O21—Si8—Cs2ⁱⁱⁱ	57.85 (13)
O15^viii—Cs3B—O4^viii	133.3 (4)	O7—Si8—Cs2ⁱⁱⁱ	134.84 (13)
O8^vii—Cs3B—O4^viii	120.4 (3)	O19—Si8—Cs2ⁱⁱⁱ	120.30 (13)
O15^viii—Cs3B—O6^viii	158.8 (6)	Cs1—Si8—Cs2ⁱⁱⁱ	94.85 (3)
O8^vii—Cs3B—O6^viii	74.9 (2)	O20—Si8—Cs1^iv	141.77 (13)
O4^viii—Cs3B—O6^viii	46.66 (13)	O21—Si8—Cs1^iv	105.59 (14)
O15^viii—Cs3B—O1	51.35 (16)	O7—Si8—Cs1^iv	42.51 (12)
O8^vii—Cs3B—O1	110.8 (3)	O19—Si8—Cs1^iv	65.46 (12)
O4^viii—Cs3B—O1	125.0 (4)	Cs1—Si8—Cs1^iv	79.75 (2)
O6^viii—Cs3B—O1	149.8 (6)	Cs2ⁱⁱⁱ—Si8—Cs1^iv	162.95 (3)
O15^viii—Cs3B—O16^viii	54.21 (15)	O20—Si8—Cs2	39.22 (11)
O8^vii—Cs3B—O16^viii	150.0 (3)	O21—Si8—Cs2	94.95 (13)
O4^viii—Cs3B—O16^viii	87.7 (2)	O7—Si8—Cs2	86.44 (12)
O6^viii—Cs3B—O16^viii	134.3 (3)	O19—Si8—Cs2	150.46 (11)
O1—Cs3B—O16^viii	49.38 (16)	Cs1—Si8—Cs2	150.06 (4)
O15^viii—Cs3B—O5^ix	111.0 (2)	Cs2ⁱⁱⁱ—Si8—Cs2	55.205 (18)
O8^vii—Cs3B—O5^ix	49.88 (16)	Cs1^iv—Si8—Cs2	128.74 (3)
O4^viii—Cs3B—O5^ix	114.6 (4)	O22—Si9—O23	113.21 (14)
O6^viii—Cs3B—O5^ix	78.3 (2)	O22—Si9—O21	109.52 (18)
O1—Cs3B—O5^ix	83.6 (3)	O23—Si9—O21	108.63 (19)
O16^viii—Cs3B—O5^ix	130.7 (5)	O22—Si9—O18	111.34 (17)
O15^viii—Cs3B—O3^viii	90.6 (2)	O23—Si9—O18	109.4 (2)
O8^vii—Cs3B—O3^viii	157.1 (5)	O21—Si9—O18	104.29 (17)
O4^viii—Cs3B—O3^viii	44.73 (12)	O22—Si9—Cs1	54.89 (11)
O6^viii—Cs3B—O3^viii	91.09 (19)	O23—Si9—Cs1	98.43 (16)
O1—Cs3B—O3^viii	90.5 (2)	O21—Si9—Cs1	65.20 (12)
O16^viii—Cs3B—O3^viii	44.18 (12)	O18—Si9—Cs1	152.14 (13)
O5^ix—Cs3B—O3^viii	145.7 (5)	O22—Si9—Cs2ⁱⁱⁱ	95.56 (13)
O15^viii—Cs3B—Si2^viii	159.9 (3)	O23—Si9—Cs2ⁱⁱⁱ	150.37 (5)
O8^vii—Cs3B—Si2^viii	99.9 (2)	O21—Si9—Cs2ⁱⁱⁱ	51.79 (13)
O4^viii—Cs3B—Si2^viii	26.56 (9)	O18—Si9—Cs2ⁱⁱⁱ	63.31 (12)
O6^viii—Cs3B—Si2^viii	26.10 (8)	Cs1—Si9—Cs2ⁱⁱⁱ	92.24 (2)
O1—Cs3B—Si2^viii	131.0 (5)	O22—Si9—Cs1^ix	78.16 (11)
O16^viii—Cs3B—Si2^viii	110.0 (2)	O23—Si9—Cs1^ix	97.46 (16)
O5^ix—Cs3B—Si2^viii	88.7 (3)	O21—Si9—Cs1^ix	145.97 (13)
O3^viii—Cs3B—Si2^viii	70.04 (14)	O18—Si9—Cs1^ix	44.82 (11)
O15^viii—Cs3B—O16	116.2 (4)	Cs1—Si9—Cs1^ix	132.96 (3)
O8^vii—Cs3B—O16	116.1 (4)	Cs2ⁱⁱⁱ—Si9—Cs1^ix	95.20 (2)
O4^viii—Cs3B—O16	74.8 (3)	Si1—O1—Sn1^xvii	131.57 (17)
O6^viii—Cs3B—O16	84.9 (3)	Si1—O1—Cs3A	125.27 (15)
O1—Cs3B—O16	65.8 (3)	Sn1^xvii—O1—Cs3A	100.12 (12)
O16^viii—Cs3B—O16	79.0 (3)	Si1—O1—Cs1^xiii	101.85 (14)
O5^ix—Cs3B—O16	67.0 (3)	Sn1^xvii—O1—Cs1^xiii	108.13 (12)
O3^viii—Cs3B—O16	79.8 (3)	Cs3A—O1—Cs1^xiii	71.91 (6)
Si2^viii—Cs3B—O16	66.8 (2)	Si1—O1—Cs3B	133.0 (3)
O15^viii—Cs3B—Cs1^xiii	57.45 (14)	Sn1^xvii—O1—Cs3B	93.2 (3)
O8^vii—Cs3B—Cs1^xiii	57.53 (14)	Cs3A—O1—Cs3B	7.9 (2)
O4^viii—Cs3B—Cs1^xiii	167.5 (5)	Cs1^xiii—O1—Cs3B	70.34 (15)
O6^viii—Cs3B—Cs1^xiii	126.7 (3)	Si1—O1—Cs3A^viii	76.02 (12)
O1—Cs3B—Cs1^xiii	53.63 (14)	Sn1^xvii—O1—Cs3A^viii	90.90 (10)
O16^viii—Cs3B—Cs1^xiii	97.3 (2)	Cs3A—O1—Cs3A^viii	88.33 (8)
O5^ix—Cs3B—Cs1^xiii	53.71 (15)	Cs1^xiii—O1—Cs3A^viii	154.40 (9)
O3^viii—Cs3B—Cs1^xiii	141.5 (3)	Cs3B—O1—Cs3A^viii	92.2 (2)
Si2^viii—Cs3B—Cs1^xiii	142.4 (4)	Si1—O2—Si7	144.3 (2)
O16—Cs3B—Cs1^xiii	94.8 (4)	Si1—O2—Cs1^xiii	90.29 (14)
O15^viii—Cs3B—Si1^viii	114.8 (2)	Si7—O2—Cs1^xiii	112.69 (15)
O8^vii—Cs3B—Si1^viii	145.5 (3)	Si1—O3—Si6	159.1 (3)
O4^viii—Cs3B—Si1^viii	25.25 (8)	Si1—O3—Cs3B^viii	85.1 (2)
O6^viii—Cs3B—Si1^viii	70.77 (15)	Si6—O3—Cs3B^viii	88.02 (19)
O1—Cs3B—Si1^viii	100.8 (3)	Si1—O3—Cs3A^viii	80.57 (13)
O16^viii—Cs3B—Si1^viii	63.64 (15)	Si6—O3—Cs3A^viii	90.22 (14)
O5^ix—Cs3B—Si1^viii	123.9 (4)	Cs3B^viii—O3—Cs3A^viii	7.7 (3)
O3^viii—Cs3B—Si1^viii	24.92 (7)	Si1—O4—Si2	129.51 (19)
Si2^viii—Cs3B—Si1^viii	46.82 (10)	Si1—O4—Cs3B^viii	98.7 (2)
O16—Cs3B—Si1^viii	64.7 (2)	Si2—O4—Cs3B^viii	93.4 (2)
Cs1^xiii—Cs3B—Si1^viii	153.4 (4)	Si1—O4—Cs3A^viii	95.66 (14)
O8—Sn1—O22ⁱⁱⁱ	89.80 (12)	Si2—O4—Cs3A^viii	89.04 (13)
O8—Sn1—O1^x	177.68 (12)	Cs3B^viii—O4—Cs3A^viii	8.8 (3)
O22ⁱⁱⁱ—Sn1—O1^x	92.32 (13)	Si1—O4—Cs2	112.55 (14)
O8—Sn1—O15^vi	95.43 (12)	Si2—O4—Cs2	114.54 (14)
O22ⁱⁱⁱ—Sn1—O15^vi	92.48 (12)	Cs3B^viii—O4—Cs2	96.3 (3)
O1^x—Sn1—O15^vi	85.41 (12)	Cs3A^viii—O4—Cs2	105.03 (9)
O8—Sn1—O16^vi	91.37 (12)	Si2—O5—Sn1^xvii	130.27 (17)
O22ⁱⁱⁱ—Sn1—O16^vi	176.09 (13)	Si2—O5—Cs3Aⁱⁱ	123.44 (14)
O1^x—Sn1—O16^vi	86.45 (12)	Sn1^xvii—O5—Cs3Aⁱⁱ	106.29 (13)
O15^vi—Sn1—O16^vi	91.12 (12)	Si2—O5—Cs1^iv	99.16 (13)
O8—Sn1—O5^x	86.35 (12)	Sn1^xvii—O5—Cs1^iv	97.58 (10)
O22ⁱⁱⁱ—Sn1—O5^x	88.07 (12)	Cs3Aⁱⁱ—O5—Cs1^iv	69.96 (6)
O1^x—Sn1—O5^x	92.80 (12)	Si2—O5—Cs3Bⁱⁱ	129.9 (3)
O15^vi—Sn1—O5^x	178.14 (12)	Sn1^xvii—O5—Cs3Bⁱⁱ	99.8 (3)
O16^vi—Sn1—O5^x	88.28 (12)	Cs3Aⁱⁱ—O5—Cs3Bⁱⁱ	7.0 (2)
O8—Sn1—Cs3B^x	122.9 (3)	Cs1^iv—O5—Cs3Bⁱⁱ	67.68 (14)
O22ⁱⁱⁱ—Sn1—Cs3B^x	125.41 (13)	Si2—O5—Cs3A^viii	76.70 (12)
O1^x—Sn1—Cs3B^x	56.3 (3)	Sn1^xvii—O5—Cs3A^viii	96.58 (10)
O15^vi—Sn1—Cs3B^x	47.0 (2)	Cs3Aⁱⁱ—O5—Cs3A^viii	99.33 (8)
O16^vi—Sn1—Cs3B^x	56.66 (14)	Cs1^iv—O5—Cs3A^viii	164.22 (9)
O5^x—Sn1—Cs3B^x	131.4 (2)	Cs3Bⁱⁱ—O5—Cs3A^viii	103.00 (19)
O8—Sn1—Cs3A^x	129.10 (9)	Si2—O6—Si6ⁱⁱ	145.3 (2)
O22ⁱⁱⁱ—Sn1—Cs3A^x	125.11 (8)	Si2—O6—Cs3B^viii	89.6 (2)
O1^x—Sn1—Cs3A^x	49.99 (9)	Si6ⁱⁱ—O6—Cs3B^viii	113.8 (2)
O15^vi—Sn1—Cs3A^x	52.78 (8)	Si2—O6—Cs3A^viii	85.23 (13)
O16^vi—Sn1—Cs3A^x	56.45 (9)	Si6ⁱⁱ—O6—Cs3A^viii	114.18 (15)
O5^x—Sn1—Cs3A^x	125.54 (8)	Cs3B^viii—O6—Cs3A^viii	8.5 (3)
Cs3B^x—Sn1—Cs3A^x	7.0 (2)	Si2—O7—Si8	142.1 (2)
O8—Sn1—Cs1ⁱⁱⁱ	54.30 (9)	Si2—O7—Cs1^iv	98.93 (15)
O22ⁱⁱⁱ—Sn1—Cs1ⁱⁱⁱ	53.05 (8)	Si8—O7—Cs1^iv	118.02 (15)
O1^x—Sn1—Cs1ⁱⁱⁱ	126.61 (9)	Si3—O8—Sn1	128.90 (17)
O15^vi—Sn1—Cs1ⁱⁱⁱ	128.78 (8)	Si3—O8—Cs3B^xiv	115.3 (3)
O16^vi—Sn1—Cs1ⁱⁱⁱ	125.17 (9)	Sn1—O8—Cs3B^xiv	115.8 (3)
O5^x—Sn1—Cs1ⁱⁱⁱ	52.84 (8)	Si3—O8—Cs3A^xiv	123.52 (15)
Cs3B^x—Sn1—Cs1ⁱⁱⁱ	175.7 (2)	Sn1—O8—Cs3A^xiv	107.58 (12)
Cs3A^x—Sn1—Cs1ⁱⁱⁱ	176.60 (2)	Cs3B^xiv—O8—Cs3A^xiv	8.6 (3)
O8—Sn1—Cs3A^xiv	45.47 (8)	Si3—O8—Cs1ⁱⁱⁱ	101.09 (13)
O22ⁱⁱⁱ—Sn1—Cs3A^xiv	106.03 (8)	Sn1—O8—Cs1ⁱⁱⁱ	96.22 (12)
O1^x—Sn1—Cs3A^xiv	132.83 (9)	Cs3B^xiv—O8—Cs1ⁱⁱⁱ	72.34 (19)
O15^vi—Sn1—Cs3A^xiv	135.00 (9)	Cs3A^xiv—O8—Cs1ⁱⁱⁱ	69.61 (6)
O16^vi—Sn1—Cs3A^xiv	72.31 (9)	Si3—O9—Si5	175.2 (3)
O5^x—Sn1—Cs3A^xiv	46.38 (9)	Si4—O10—Si3	143.6 (2)
Cs3B^x—Sn1—Cs3A^xiv	128.32 (11)	Si4—O10—Cs1ⁱⁱⁱ	108.30 (14)
Cs3A^x—Sn1—Cs3A^xiv	128.760 (13)	Si3—O10—Cs1ⁱⁱⁱ	103.11 (14)
Cs1ⁱⁱⁱ—Sn1—Cs3A^xiv	52.982 (8)	Si4—O10—Cs2	90.03 (13)
O8—Sn1—Cs1^xi	136.49 (8)	Si3—O10—Cs2	92.47 (13)
O22ⁱⁱⁱ—Sn1—Cs1^xi	72.06 (8)	Cs1ⁱⁱⁱ—O10—Cs2	115.94 (9)
O1^x—Sn1—Cs1^xi	45.31 (8)	Si5^vi—O11—Si3	130.59 (18)
O15^vi—Sn1—Cs1^xi	48.21 (9)	Si5^vi—O11—Cs2	108.23 (14)
O16^vi—Sn1—Cs1^xi	109.41 (9)	Si3—O11—Cs2	116.67 (14)
O5^x—Sn1—Cs1^xi	130.44 (9)	Si4—O12—Sn2^ix	164.45 (19)
Cs3B^x—Sn1—Cs1^xi	53.90 (11)	Si4—O12—Cs2	100.26 (13)
Cs3A^x—Sn1—Cs1^xi	53.058 (9)	Sn2^ix—O12—Cs2	94.97 (10)
Cs1ⁱⁱⁱ—Sn1—Cs1^xi	125.031 (10)	Si6—O13—Si4	138.7 (2)
Cs3A^xiv—Sn1—Cs1^xi	176.69 (2)	Si5—O14—Si4^vi	139.6 (2)
O8—Sn1—Cs3A^vi	116.76 (8)	Si5—O14—Cs2^xii	99.13 (13)
O22ⁱⁱⁱ—Sn1—Cs3A^vi	130.18 (9)	Si4^vi—O14—Cs2^xii	114.59 (14)
O1^x—Sn1—Cs3A^vi	61.07 (9)	Si5—O14—Cs1^xv	92.19 (14)
O15^vi—Sn1—Cs3A^vi	123.03 (8)	Si4^vi—O14—Cs1^xv	88.28 (13)
O16^vi—Sn1—Cs3A^vi	46.12 (9)	Cs2^xii—O14—Cs1^xv	122.15 (10)
O5^x—Sn1—Cs3A^vi	55.46 (8)	Si5—O15—Sn1^xii	129.25 (17)
Cs3B^x—Sn1—Cs3A^vi	76.1 (2)	Si5—O15—Cs3B^viii	120.2 (4)
Cs3A^x—Sn1—Cs3A^vi	70.79 (2)	Sn1^xii—O15—Cs3B^viii	103.3 (3)
Cs1ⁱⁱⁱ—Sn1—Cs3A^vi	108.007 (10)	Si5—O15—Cs3A^viii	128.03 (16)
Cs3A^xiv—Sn1—Cs3A^vi	74.36 (3)	Sn1^xii—O15—Cs3A^viii	97.02 (10)
Cs1^xi—Sn1—Cs3A^vi	104.687 (12)	Cs3B^viii—O15—Cs3A^viii	8.1 (3)
O12ⁱⁱⁱ—Sn2—O12ⁱⁱ	180.00 (18)	Si5—O15—Cs1^xv	111.68 (14)
O12ⁱⁱⁱ—Sn2—O20	88.36 (12)	Sn1^xii—O15—Cs1^xv	104.69 (12)
O12ⁱⁱ—Sn2—O20	91.64 (12)	Cs3B^viii—O15—Cs1^xv	73.1 (2)
O12ⁱⁱⁱ—Sn2—O20^xi	91.64 (12)	Cs3A^viii—O15—Cs1^xv	69.45 (6)
O12ⁱⁱ—Sn2—O20^xi	88.36 (12)	Si6—O16—Sn1^xii	139.84 (18)
O20—Sn2—O20^xi	180.0	Si6—O16—Cs3A	108.61 (13)
O12ⁱⁱⁱ—Sn2—O17ⁱⁱⁱ	90.26 (12)	Sn1^xii—O16—Cs3A	107.16 (12)
O12ⁱⁱ—Sn2—O17ⁱⁱⁱ	89.74 (12)	Si6—O16—Cs3B^viii	97.1 (3)
O20—Sn2—O17ⁱⁱⁱ	85.77 (12)	Sn1^xii—O16—Cs3B^viii	92.74 (16)
O20^xi—Sn2—O17ⁱⁱⁱ	94.23 (12)	Cs3A—O16—Cs3B^viii	102.1 (3)
O12ⁱⁱⁱ—Sn2—O17ⁱⁱ	89.74 (12)	Si6—O16—Cs3A^viii	101.94 (14)
O12ⁱⁱ—Sn2—O17ⁱⁱ	90.26 (12)	Sn1^xii—O16—Cs3A^viii	93.15 (10)
O20—Sn2—O17ⁱⁱ	94.23 (12)	Cs3A—O16—Cs3A^viii	94.00 (8)
O20^xi—Sn2—O17ⁱⁱ	85.77 (12)	Cs3B^viii—O16—Cs3A^viii	8.4 (3)
O17ⁱⁱⁱ—Sn2—O17ⁱⁱ	180.00 (18)	Si6—O16—Cs3B	110.77 (18)
O12ⁱⁱⁱ—Sn2—Cs2ⁱⁱⁱ	55.33 (8)	Sn1^xii—O16—Cs3B	105.33 (17)
O12ⁱⁱ—Sn2—Cs2ⁱⁱⁱ	124.67 (8)	Cs3A—O16—Cs3B	2.28 (13)
O20—Sn2—Cs2ⁱⁱⁱ	53.35 (9)	Cs3B^viii—O16—Cs3B	101.0 (3)
O20^xi—Sn2—Cs2ⁱⁱⁱ	126.65 (9)	Cs3A^viii—O16—Cs3B	92.79 (14)
O17ⁱⁱⁱ—Sn2—Cs2ⁱⁱⁱ	51.61 (8)	Si7—O17—Sn2^ix	130.26 (17)
O17ⁱⁱ—Sn2—Cs2ⁱⁱⁱ	128.39 (8)	Si7—O17—Cs2	125.86 (15)
O12ⁱⁱⁱ—Sn2—Cs2ⁱⁱ	124.67 (8)	Sn2^ix—O17—Cs2	98.65 (10)
O12ⁱⁱ—Sn2—Cs2ⁱⁱ	55.33 (8)	Si7—O17—Cs2ⁱⁱⁱ	108.81 (14)
O20—Sn2—Cs2ⁱⁱ	126.65 (9)	Sn2^ix—O17—Cs2ⁱⁱⁱ	104.82 (12)
O20^xi—Sn2—Cs2ⁱⁱ	53.35 (9)	Cs2—O17—Cs2ⁱⁱⁱ	72.17 (6)
O17ⁱⁱⁱ—Sn2—Cs2ⁱⁱ	128.39 (8)	Si7—O18—Si9	137.1 (2)
O17ⁱⁱ—Sn2—Cs2ⁱⁱ	51.61 (8)	Si7—O18—Cs1^ix	97.47 (13)
Cs2ⁱⁱⁱ—Sn2—Cs2ⁱⁱ	180.0	Si9—O18—Cs1^ix	114.47 (14)
O12ⁱⁱⁱ—Sn2—Cs2	109.74 (8)	Si7—O18—Cs2ⁱⁱⁱ	90.66 (13)
O12ⁱⁱ—Sn2—Cs2	70.26 (8)	Si9—O18—Cs2ⁱⁱⁱ	93.76 (13)
O20—Sn2—Cs2	45.77 (8)	Cs1^ix—O18—Cs2ⁱⁱⁱ	124.26 (10)
O20^xi—Sn2—Cs2	134.23 (8)	Si8—O19—Si7ⁱⁱ	129.52 (18)
O17ⁱⁱⁱ—Sn2—Cs2	47.71 (9)	Si8—O19—Cs1	117.12 (14)
O17ⁱⁱ—Sn2—Cs2	132.29 (9)	Si7ⁱⁱ—O19—Cs1	109.67 (13)
Cs2ⁱⁱⁱ—Sn2—Cs2	54.535 (8)	Si8—O20—Sn2	129.48 (17)
Cs2ⁱⁱ—Sn2—Cs2	125.465 (8)	Si8—O20—Cs2	122.70 (15)
O12ⁱⁱⁱ—Sn2—Cs2^xi	70.26 (8)	Sn2—O20—Cs2	107.37 (11)
O12ⁱⁱ—Sn2—Cs2^xi	109.74 (8)	Si8—O20—Cs2ⁱⁱⁱ	103.61 (14)
O20—Sn2—Cs2^xi	134.23 (8)	Sn2—O20—Cs2ⁱⁱⁱ	97.05 (12)
O20^xi—Sn2—Cs2^xi	45.77 (8)	Cs2—O20—Cs2ⁱⁱⁱ	72.15 (6)
O17ⁱⁱⁱ—Sn2—Cs2^xi	132.29 (9)	Si8—O21—Si9	151.9 (3)
O17ⁱⁱ—Sn2—Cs2^xi	47.71 (9)	Si8—O21—Cs2ⁱⁱⁱ	98.65 (14)
Cs2ⁱⁱⁱ—Sn2—Cs2^xi	125.466 (8)	Si9—O21—Cs2ⁱⁱⁱ	106.27 (15)
Cs2ⁱⁱ—Sn2—Cs2^xi	54.534 (8)	Si8—O21—Cs1	91.31 (13)
Cs2—Sn2—Cs2^xi	180.0	Si9—O21—Cs1	90.47 (13)
O1—Si1—O2	110.44 (18)	Cs2ⁱⁱⁱ—O21—Cs1	113.55 (10)
O1—Si1—O3	111.15 (18)	Si9—O22—Sn1ⁱⁱⁱ	160.20 (19)
O2—Si1—O3	108.86 (18)	Si9—O22—Cs1	102.17 (14)
O1—Si1—O4	111.33 (16)	Sn1ⁱⁱⁱ—O22—Cs1	97.49 (10)
O2—Si1—O4	108.37 (18)	Si9^iv—O23—Si9	179.5 (3)
O3—Si1—O4	106.57 (18)

Symmetry codes: (i) −x+1, y+1, −z+1/2; (ii) x, y+1, z; (iii) −x+1, −y−1, −z; (iv) −x+1, y, −z+1/2; (v) x−1/2, −y−1/2, z; (vi) −x+3/2, y+1/2, −z; (vii) x, −y−2, z+1/2; (viii) −x+3/2, −y−3/2, −z+1/2; (ix) x, y−1, z; (x) x, −y−1, z−1/2; (xi) −x+1, −y, −z; (xii) −x+3/2, y−1/2, −z; (xiii) −x+1, y−1, −z+1/2; (xiv) x, −y−2, z−1/2; (xv) x+1/2, −y−1/2, z; (xvi) −x+3/2, −y−5/2, −z+1/2; (xvii) x, −y−1, z+1/2.

Crystal data (Å, °) of Cs₂M^IVSi₆O₁₅ compounds top

M	Ti (single-crystal data)^a	Ti (powder data)^b	Zr^c	Th (173 K data)^d	Th (293 K data)^e	U^f
Space group	C2/c	Cc	C2/m	Pca2₁	Cmc2₁	Cmc2₁
Z	4	4	6	4	4	4
a	13.386 (5)	12.988 (2)	26.610 (10)	16.2920 (10)	7.2813 (15)	7.2717 (3)
b	7.423 (3)	7.5014 (3)	7.506 (2)	7.2154 (6)	16.420 (3)	16.3061 (7)
c	15.134 (5)	15.156 (3)	11.602 (4)	13.6800 (10)	13.591 (3)	13.4983 (6)
β	107.71 (3)	105.80 (3)	107.43 (2)	90	90	90
V	1432.51	1420.83	2210.92	1608.13	1624.92	1600.53

References: (a) Grey et al. (1997); (b) Nyman et al. (2000); (c) Jolicart et al. (1996); (d) Woodward et al. (2005); (e) Mann et al. (2015); (f) Liu & Lii (2011).

Acknowledgements

The X-ray centre of the Vienna University of Technology is acknowledged for financial support and for providing access to the single-crystal and powder diffractometers.

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