Crystal structure of eveslogite revealed by electron diffraction techniques: a titanosilicate mineral with structurally and compositionally distinct nanoscopic tubular units

Buchsteiner, E.; Klementová, M.; Depmeier, W.; Krivovichev, S.V.; Czank, M.; Schowalter, M.; Palatinus, L.; Rozhdestvenskaya, I.V.; Yakovenchuk, V.; Kolb, U.

doi:10.1107/S2052520626008620

Figure 5
Twinning in Evl. TEM images of crystals and sections through diffraction data are shown: (a) untwinned crystal, (b) h0l section of an untwinned crystal. (c) Schematic projection of the crystal structure of an untwinned crystal of Evl. (d) Twinned crystal, (e) h0l section of a twinned crystal. (f) The scheme of twinning of Evl with two twin components related by a twofold rotation around the a axis. The red and black arrows show the orientations of the Fe–H₂O and Nb–O bonds, respectively; the black ellipse indicates a twofold axis acting as a twin operator; the blue dashed line shows the border between different twin domains related by the twofold axis parallel to the a axis.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 82| Part 5| October 2026| Pages 500-512

https://doi.org/10.1107/S2052520626008620

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