mineral
Rough green calcite
Calcite, CaCO₃
AI-generated identification · may be incorrectPale green to white, translucent and vitreous to pearly; Mohs hardness 3, trigonal crystal system, perfect rhombohedral cleavage, specific gravity about 2.7. The photo’s appearance is consistent with calcite, though identification from an image is uncertain.
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Physical properties
Pale green to white, translucent and vitreous to pearly; Mohs hardness 3, trigonal crystal system, perfect rhombohedral cleavage, specific gravity about 2.7. The photo’s appearance is consistent with calcite, though identification from an image is uncertain.
Formation & geological history
Forms in limestone, marble, veins, and hydrothermal deposits through precipitation or recrystallization; calcite occurs in rocks of many geological ages.
Uses & applications
Used in cement, lime, and construction; attractive colored pieces are sold as decorative or collectible specimens.
Geological facts
Calcite effervesces in dilute acid and is easily scratched by a copper coin or knife, useful checks for distinguishing it from harder green minerals.
Field identification & locations
Look for softness, rhombohedral cleavage, and vigorous fizz with dilute acid. Common worldwide, including Mexico, the United States, and Brazil.
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