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 Results for calcite in section 3.3.7 of 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 ...

Mechanical twinning
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.7.3, pp. 439-440 [ doi:10.1107/97809553602060000917 ]
... long time. Well known examples are the deformation twins of calcite, galena, chalcopyrite and cubic metals. The characteristic feature is the ... This case is illustrated by the famous deformation twins of calcite (Fig. 3.3.7.3): The eigensymmetry of calcite is , and the most conspicuous twin element is the ...

Twinning by nucleation
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.7.1.1, pp. 436-437 [ 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 ...

Growth twinning
Hahn, Th. and Klapper, H.  International Tables for Crystallography (2013). Vol. D, Section 3.3.7.1, pp. 436-438 [ 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 ...

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