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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 , Å [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]

Accuracy in Rietveld quantitative phase analysis with strictly monochromatic Mo and Cu radiations
León-Reina, L., Cuesta, A., García-Maté, M., Álvarez-Pinazo, G., Santacruz, I., Vallcorba, O., De la Torre, A.G. and Aranda, M.A.G.  International Tables for Crystallography (2018). Vol. H, ch. 3.10, pp. 374-384 [ doi:10.1107/97809553602060000955 ]
... Zincite ZnO 65120 285 244 -/89.1 Albertsson et al. (1989 ) Calcite CaCO3 80869 194 22 27/7.3 Maslen et al. (1995 ... Peacor (1965 ) 3.10.2.2. Crystalline inorganic series | | A constant matrix of calcite (C), gypsum (Gp) and quartz (Q) was prepared. Six samples ... . 3.10.2.4. Variable amorphous content series | | A constant matrix of calcite (C) and zincite (Z) was prepared. Five samples with ...

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]

Boolean logic in phase identification
Kaduk, J.A.  International Tables for Crystallography (2018). Vol. H, Section 3.7.2.4, pp. 309-313 [ doi:10.1107/97809553602060000952 ]
... diffractometer. Any commercial search/match program will easily identify magnesian calcite (Fig. 3.7.2 ; files kadu1389.gsas, kadu1389.raw and iitd26_0510.prm, available in ... scale. Weak peaks not accounted for by the major magnesian calcite phase are apparent and additional tools in the Powder Diffraction ... x in Ca1-xMgx(CO3) (Fig. 3.7.3 ). This magnesian calcite in the water-still scale has a higher Mg ...
     [more results from section 3.7.2 in volume H]

Quantitative phase analysis
Madsen, I., Scarlett, N., Kleeberg, R. and Knorr, K.  International Tables for Crystallography (2018). Vol. H, ch. 3.9, pp. 344-373 [ doi:10.1107/97809553602060000954 ]
... lowest intensity. The identified phases include gibbsite Al(OH)3, calcite CaCO3, haematite Fe2O3, lime CaO, calcium ferrites CF and CFF ... synthetic mixture of gibbsite, Al(OH)3, haematite, Fe2O3, and calcite, CaCO3, was heated to about 1573K using an Anton Paar ... 533 and 868K results from the decomposition of gibbsite and calcite, respectively. There are no possible mechanisms in this system ...

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