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 Results for calcite in section 1.6.4 of 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 ...

Uniaxial figures
Glazer, A. M. and Cox, K. G.  International Tables for Crystallography (2013). Vol. D, Section 1.6.4.12, pp. 164-165 [ doi:10.1107/97809553602060000905 ]
... an interference figure, consider a simple example, a specimen of calcite cut at right angles to the c crystallographic axis. Calcite is uniaxial negative, with the optic axis parallel to c. ... 1.6.4.10 | | (a) Vibration directions of an oblique ray passing through calcite, viewed relative to the indicatrix. OA is the optic ...

Vibration directions
Glazer, A. M. and Cox, K. G.  International Tables for Crystallography (2013). Vol. D, Section 1.6.4.4, pp. 158-159 [ 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 ...

Other methods of measuring birefringence
Glazer, A. M. and Cox, K. G.  International Tables for Crystallography (2013). Vol. D, Section 1.6.4.10, p. 163 [ doi:10.1107/97809553602060000905 ]
... the retardation of the specimen. The Berek compensator uses a calcite plate 0.01mm thick, whereas the Ehringhaus compensator has compound compensating plates of either quartz or calcite, made of two sections of equal thickness cut parallel to ...

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