mineral

Raw green calcite (probable)

Calcite, CaCO₃; green coloration may reflect inclusions or alteration minerals

AI-generated identification · may be incorrect

Pale green to cream, translucent-to-opaque, vitreous to pearly luster, commonly rhombohedral cleavage; Mohs hardness 3 and specific gravity about 2.71. The rough, crystalline texture and weakly colored zones fit calcite, though similar material could be prehnite, fluorite, or serpentine.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, limestone cavities, and metamorphosed carbonate rocks; specimens may range from ancient to geologically recent depending on the host deposit. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used industrially for cement, lime, aggregate, and chemical manufacture; attractive transparent or colored crystals are collected and occasionally used decoratively. This rough piece has modest specimen value.

Geological facts

Calcite effervesces readily with dilute hydrochloric acid and shows strong birefringence when transparent. Its rhombohedral cleavage distinguishes it from many green, massive minerals.

Field identification & locations

Common worldwide, including Mexico, the United States, Iceland, and China. Test a hidden spot with dilute acid, check for rhombohedral cleavage, and avoid scratching it with a steel blade unless necessary.