Optical properties of calcite

Calcite, a widely occurring carbonate mineral (CaCO₃), exhibits unique optical properties due to its anisotropic nature and strong birefringence. It crystallizes in the trigonal system and shows rhombohedral cleavage. Under plane-polarized light in thin-section microscopy, calcite appears colorless with __________ _________ _______ ___ ______ __________ ____ ___ ______ __________ ________.
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