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Twinning of crystals
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, ch. 3.3, pp. 413-487 [ doi:10.1107/97809553602060000917 ]
... shown in Fig. 3.3.6.3 for gypsum, in Fig. 3.3.6.7 for calcite and in Fig. 3.3.6.8(a) for a spinel (111) twin. ... entrant angles are presented in Fig. 3.3.6.3 (gypsum) and 3.3.6.7 (calcite). In repeated growth twins (e.g. albite, Fig. 3.3.6.13) the ... some rhombohedral crystals such as corundum Al2O3 (Wallace & White, 1967), calcite CaCO3 or FeBO3 (calcite structure) (Kotrbova et al., 1985; ...

Classical linear crystal optics
Glazer, A. M. and Cox, K. G.  International Tables for Crystallography (2013). Vol. D, ch. 1.6, pp. 153-180 [ doi:10.1107/97809553602060000905 ]
... rough values for the refractive indices, and hence birefringence, of calcite and aragonite. His theory relied upon the summation of polarizability ... can be used to illustrate this fundamental concept. The mineral calcite (CaCO3) is always given as an example of extreme double ... is quoted as the birefringence of the mineral, and for calcite it is unusually large (0.172) by the standards of ...

Twin boundaries
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.10, pp. 450-469 [ doi:10.1107/97809553602060000917 ]
... possibly due to complications arising from the penetration morphology. (5) Calcite deformation twins (e-twins) [cf. Section 3.3.7.3(i) and Fig. 3.3.7.3]. The deformation twinning in calcite has been extensively studied by Barber & Wenk (1979). Recently ... of Sapriel's strain compatibility theory of domain walls. For calcite (space group ) three unit cells are in use: (i) ...
     [more results from section 3.3.10 in volume D]

Practical observation of crystals
Glazer, A. M. and Cox, K. G.  International Tables for Crystallography (2013). Vol. D, Section 1.6.4, pp. 157-169 [ doi:10.1107/97809553602060000905 ]
... can be used to illustrate this fundamental concept. The mineral calcite (CaCO3) is always given as an example of extreme double ... is quoted as the birefringence of the mineral, and for calcite it is unusually large (0.172) by the standards of other ... a diagnostic optical property of the material concerned. Consider a calcite crystal lying with its c axis in the plane ...
     [more results from section 1.6.4 in 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 , Ċ [hexagonal axes, structural X-ray cell; cf. Section 3.3.10.2.2, ...
     [more results from section 3.3.8 in volume D]

Genetic classification of twins
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.7, pp. 436-440 [ doi:10.1107/97809553602060000917 ]
... Typical examples are the penetration twins of iron borate FeBO3 (calcite structure), which are intergrowths of two rhombohedra, a reverse and ... crystals has not been observed so far. Crystals of isostructural calcite and NaNO3, on the other hand, do not exhibit penetration ... long time. Well known examples are the deformation twins of calcite, galena, chalcopyrite and cubic metals. The characteristic feature is ...
     [more results from section 3.3.7 in volume D]

Examples of twinned crystals
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.6, pp. 423-436 [ doi:10.1107/97809553602060000917 ]
... entrant angles are presented in Fig. 3.3.6.3 (gypsum) and 3.3.6.7 (calcite). In repeated growth twins (e.g. albite, Fig. 3.3.6.13) the ... some rhombohedral crystals such as corundum Al2O3 (Wallace & White, 1967), calcite CaCO3 or FeBO3 (calcite structure) (Kotrbova et al., 1985; Klapper, 1987), growth twinning ...
     [more results from section 3.3.6 in volume D]

The optical indicatrix
Glazer, A. M. and Cox, K. G.  International Tables for Crystallography (2013). Vol. D, Section 1.6.3.2, pp. 156-157 [ doi:10.1107/97809553602060000905 ]
... rough values for the refractive indices, and hence birefringence, of calcite and aragonite. His theory relied upon the summation of polarizability ... References Bragg, W. L. (1924). The refractive indices of calcite and aragonite. Proc. R. Soc. London Ser. A, 105, 370. ...
     [more results from section 1.6.3 in volume D]

Thermal expansion
Küppers, H.  International Tables for Crystallography (2013). Vol. D, ch. 1.4, pp. 100-105 [ doi:10.1107/97809553602060000903 ]
... trigonal (or tetragonal or hexagonal) crystal with and (similar to calcite). (a) Quadric, (b) strain ellipsoid (greatly exaggerated), (c) polar ... negative expansion) in directions perpendicular to that direction (e.g. in calcite). The volume expansion, i.e. the trace of , is usually ...

Variation of Young's modulus with orientation
Authier, A. and Zarembowitch, A.  International Tables for Crystallography (2013). Vol. D, Section 1.3.3.4.4, p. 84 [ doi:10.1107/97809553602060000902 ]
... have as point group, for tin (Fig. 1.3.3.4e, ) and for calcite (Fig. 1.3.3.4f, ). But in the case of zinc (Fig. ... cubic, anisotropy factor ; (d) Zn, hexagonal; (e) Sn, tetragonal; (f) calcite, trigonal. References International Tables for Crystallography (2013). Vol. D ...
     [more results from section 1.3.3 in volume D]

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