mineral
Likely green calcite (rough crystal)
Calcite, CaCO₃
AI-generated identification · may be incorrectPale mint-green, translucent to opaque, with a vitreous to pearly luster and commonly rhombohedral cleavage; Mohs hardness 3. The photo lacks scale and diagnostic tests, so identification is tentative.
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Physical properties
Pale mint-green, translucent to opaque, with a vitreous to pearly luster and commonly rhombohedral cleavage; Mohs hardness 3. The photo lacks scale and diagnostic tests, so identification is tentative.
Formation & geological history
Calcite forms in sedimentary and hydrothermal settings; green color may come from trace impurities or treatment. Calcite occurs in rocks of many ages, so the specimen’s age cannot be determined from the image.
Uses & applications
Collected as a decorative mineral and used in ornaments; calcite is also important in cement, lime, and aggregate production.
Geological facts
Calcite effervesces in dilute acid and is readily scratched by a copper coin, useful checks for a suspected specimen.
Field identification & locations
The short, pale-green piece appears crystalline, but similar-looking minerals include fluorite and gypsum; cleavage, hardness, and acid reaction can help distinguish them. Calcite is widespread worldwide.
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