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Twinning of crystals
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
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
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
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
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
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
International Tables for Crystallography (2019). 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
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]
Powder-diffraction characterization of cements
International Tables for Crystallography (2019). Vol. H, ch. 7.12, pp. 855-867 [ doi:10.1107/97809553602060000986 ]
... in this context for the analysis of blended cements. Initially, calcite, pulverized fly ash (PFA), blast furnace slag (BFS) and pozzolane ... 001] for the AFm family (defined below), [104] for the calcite family, for alite-M3 and [100] for ettringite. Spherical harmonics ... Ca3Al2O6), calcium aluminoferrite (Ca4Al2Fe2O10), gypsum (CaSO4·2H2O), anhydrite (CaSO4) and calcite (CaCO3) are abbreviated as C3S, C2S, C3A, C4AF, CSH2, ...
Introduction
International Tables for Crystallography (2019). Vol. H, Section 7.2.1, pp. 737-742 [ doi:10.1107/97809553602060000976 ]
... another constituent of some paints) also has three main polymorphs: calcite, aragonite and vaterite. 7.2.1.3.3. Pathology | | Establishment of the post-mortem ... and the monohydrate in 46%. Calcium carbonate, identified as calcite and aragonite, was present in 23 and 8% of the ... were examined by XRPD. The unstained wall consisted solely of calcite, and the `bloodstain' consisted of whewellite (CaC2O4·H2O) and ...
[more results from section 7.2.1 in volume 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
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
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
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
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
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
International Tables for Crystallography (2019). 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
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]
Powder-diffraction characterization of cements
International Tables for Crystallography (2019). Vol. H, ch. 7.12, pp. 855-867 [ doi:10.1107/97809553602060000986 ]
... in this context for the analysis of blended cements. Initially, calcite, pulverized fly ash (PFA), blast furnace slag (BFS) and pozzolane ... 001] for the AFm family (defined below), [104] for the calcite family, for alite-M3 and [100] for ettringite. Spherical harmonics ... Ca3Al2O6), calcium aluminoferrite (Ca4Al2Fe2O10), gypsum (CaSO4·2H2O), anhydrite (CaSO4) and calcite (CaCO3) are abbreviated as C3S, C2S, C3A, C4AF, CSH2, ...
Introduction
International Tables for Crystallography (2019). Vol. H, Section 7.2.1, pp. 737-742 [ doi:10.1107/97809553602060000976 ]
... another constituent of some paints) also has three main polymorphs: calcite, aragonite and vaterite. 7.2.1.3.3. Pathology | | Establishment of the post-mortem ... and the monohydrate in 46%. Calcium carbonate, identified as calcite and aragonite, was present in 23 and 8% of the ... were examined by XRPD. The unstained wall consisted solely of calcite, and the `bloodstain' consisted of whewellite (CaC2O4·H2O) and ...
[more results from section 7.2.1 in volume H]
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