mineral

Green calcite (probable)

Calcite, CaCO₃

AI-generated identification · may be incorrect

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.

Identified August 31, 2026More mineral →

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Physical properties

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.