mineral

Pale green calcite

Calcite (CaCO₃), likely crystalline limestone or calcite-rich material

AI-generated identification · may be incorrect

Soft (Mohs 3), white to pale green, vitreous to pearly luster, translucent, and commonly rhombohedral with excellent rhombohedral cleavage; specific gravity about 2.71. The rough, blocky specimen shows cleavage surfaces and faint green coloration, possibly from inclusions.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms by precipitation from carbonate-rich groundwater or seawater, in limestone, veins, caves, and hydrothermal settings; specimens may range from ancient sedimentary deposits to young cavity growths. Exact age and locality cannot be determined from the image.

Uses & applications

Calcite is used in cement, lime, construction aggregate, soil treatment, and chemical manufacture; attractive crystals are collected and occasionally used decoratively. This rough piece likely has modest specimen value.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar if powdered, distinguishing it from many similar pale minerals. It commonly exhibits double refraction, visible through a clear crystal.

Field identification & locations

Look for rhombohedral cleavage, low hardness, and acid reaction; distinguish it from quartz, which is harder and lacks cleavage. Common worldwide, especially in limestone regions, hydrothermal veins, and cave deposits.