mineral
Raw green calcite (likely)
Calcite, calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectPale green, translucent, vitreous-to-pearly luster, and prominent rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The irregular translucent piece could also be fluorite or another green mineral, so identification is provisional.
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Physical properties
Pale green, translucent, vitreous-to-pearly luster, and prominent rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The irregular translucent piece could also be fluorite or another green mineral, so identification is provisional.
Formation & geological history
Calcite commonly forms in hydrothermal veins, carbonate rocks, and cavities; green color may result from trace metals or inclusions. Most specimens are geologically young relative to their host rocks, ranging from Paleozoic to Cenozoic.
Uses & applications
Used in cement, lime, aggregate, chemical processing, and as a decorative or collector mineral; generally not suitable for jewelry because it scratches easily.
Geological facts
Calcite effervesces vigorously with dilute hydrochloric acid or vinegar, though a weak reaction to vinegar may be difficult to see. It commonly shows excellent rhombohedral cleavage and can display double refraction.
Field identification & locations
Common worldwide, including Mexico, the United States, Brazil, China, and Iceland; test cleavage and hardness gently, and avoid acids if the specimen is valuable. A gemological or mineralogical test would distinguish it from fluorite (hardness 4, cubic cleavage).
