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Calcspar

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Calcspar --> calcite

(Science: microscopy) a doubly refracting mineral used in the manufacture of polarizing prisms. It is uniaxial negative and in the trigonal diversion of the hexagonal system of crystals. Its indexes are epsilon =1.486, omega =1.658, its hardness is 3 on the mohr scale and specific gravity 2.711.

See: balsam, canada.