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 Results for calcite in section 3.3.8 of volume D
Lattice aspects of twinning
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.8, pp. 440-446 [ doi:10.1107/97809553602060000917 ]
... centrosymmetric. Well known examples are the (0001) contact twins of calcite, the penetration twins of iron borate, FeBO3, with the calcite structure, and the spinel twins of cubic crystals (cf. Examples ... 0.87 3 No twin (101) [102] 0.87 3 No twin Calcite , [hexagonal axes, structural X-ray cell; cf. Section 3.3.10.2.2, ...

Twin obliquity and lattice pseudosymmetry
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.8.5, pp. 444-446 [ doi:10.1107/97809553602060000917 ]
... 0.87 3 No twin (101) [102] 0.87 3 No twin Calcite , [hexagonal axes, structural X-ray cell; cf. Section 3.3.10.2.2, Example ... Section 3.3.9.2 under the aspect of `reticular pseudo-merohedry'. Calcite: For calcite, 19 lattice pseudosymmetries obeying Friedel's `permissible criteria' are ...

Twinning of isostructural crystals
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.8.6, p. 446 [ doi:10.1107/97809553602060000917 ]
... boundaries for these three twin laws. (ii) Iron borate FeBO3, calcite CaCO3 and sodium nitrate NaNO3 crystallize under normal conditions in the calcite structure with space group . The rhombohedral lattice allows twinning ... twins). This kind of twinning is comparatively rare in calcite, where the twins usually appear with another morphology [contact ...

Twins with three-dimensional twin lattices (`triperiodic' twins)
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.8.3, pp. 442-443 [ doi:10.1107/97809553602060000917 ]
... centrosymmetric. Well known examples are the (0001) contact twins of calcite, the penetration twins of iron borate, FeBO3, with the calcite structure, and the spinel twins of cubic crystals (cf. Examples ...

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