Calcite is a highly abundant and diverse mineral, easily recognized by its rhombohedral cleavage, glassy luster, and wide variety of colors. It can be crystalline, massive, or stalactitic, and often shows a fascinating optical property called double refraction, where objects viewed through clear calcite appear doubled.
Because it forms in so many environments, calcite comes in countless forms, from transparent Iceland Spar to colorful masses and stalactites.
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