mineral
Tumbled pale green calcite
Calcite (CaCO₃)
AI-generated identification · may be incorrectTypically pale green to cream, translucent, with vitreous-to-pearly luster and rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.7. The smooth rounded surface indicates tumbling or polishing.
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Physical properties
Typically pale green to cream, translucent, with vitreous-to-pearly luster and rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.7. The smooth rounded surface indicates tumbling or polishing.
Formation & geological history
Calcite forms in sedimentary limestone, hydrothermal veins, cavities, and metamorphic marble; green color may result from inclusions or trace elements. Deposits range from Precambrian to modern geological ages.
Uses & applications
Used for cement, lime, soil treatment, and as a carbonate mineral specimen; attractive polished pieces are sold for collecting and décor, but this example is not typically jewelry-grade.
Geological facts
Calcite effervesces vigorously with dilute hydrochloric acid and shows strong birefringence. It is much softer than quartz and can be scratched by a steel blade.
Field identification & locations
Commonly found worldwide, including Mexico, Brazil, China, and the United States. Confirm with a hardness test and acid reaction; avoid vinegar if a definitive test is needed because it may react weakly.
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