 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 1]](bs0005fig1mag.jpg)
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Figure 1
(a) Idealized representation of the linkage of silica tetrahedra in the (Si2O5) layer parallel to (010) in α-K3NdSi6O15·2H2O. In the actual structure the layer is highly corrugated (with corrugations running along c), whereas in this representation all tetrahedra are oriented such that the face composed of three bridging oxygen atoms is exactly parallel to (010). Tetrahedra for which the terminating vertex is below the plane formed by the three bridging vertices (downward directed) are shaded. Those oriented in the opposite direction are not. (b) The wollastonite chain with a three-tetrahedra periodicity. (c) Condensation of two wollastonite chains to form the xonotlite double chain having a sequence of eight-membered rings. (d) Coalescence of a pair of xonotlite chains to form a portion of the Si2O5 layer found in α-K3NdSi6O15·2H2O. Four- and six-membered rings alternate along the interface between the xonotlite ribbons. |
![[Figure 1]](bs0005fig1.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
