mineral
Green calcite (probable)
Calcite, CaCO₃
AI-generated identification · may be incorrectPale green, translucent-to-opaque rough material with vitreous to pearly luster and prominent cleavage; Mohs hardness 3, trigonal crystal structure, specific gravity about 2.71. The pale patches and relatively soft appearance are consistent with calcite, though aragonite or green fluorite are possible alternatives.
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Physical properties
Pale green, translucent-to-opaque rough material with vitreous to pearly luster and prominent cleavage; Mohs hardness 3, trigonal crystal structure, specific gravity about 2.71. The pale patches and relatively soft appearance are consistent with calcite, though aragonite or green fluorite are possible alternatives.
Formation & geological history
Typically forms in limestone, hydrothermal veins, cavities, and metamorphic carbonate rocks through precipitation from calcium-rich fluids; specimens may range from recent to Paleozoic or older depending on host rock.
Uses & applications
Used for lime and cement, aggregate, soil treatment, and chemical manufacture; attractive pieces are collected, but this rough specimen has limited jewelry value because calcite scratches easily.
Geological facts
Calcite effervesces strongly with dilute hydrochloric acid or vinegar, especially when powdered; green coloration can result from inclusions or trace elements rather than the calcite itself.
Field identification & locations
Test a concealed spot with vinegar, check hardness against a copper coin or steel knife, and examine cleavage surfaces; common sources include Mexico, Brazil, China, and the United States.
