mineral

Tumbled green calcite

Calcite (CaCO₃), likely pale green variety

AI-generated identification · may be incorrect

Mohs hardness 3; translucent pale green to whitish color, vitreous to pearly luster, trigonal crystal structure, and perfect rhombohedral cleavage. The rounded form is tumbled and polished, with visible internal veining and cloudiness.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms from calcium-rich groundwater, hydrothermal fluids, or sedimentary carbonate deposits; green coloration may result from trace minerals or inclusions. Calcite deposits range from ancient to modern geological ages.

Uses & applications

Used for decorative objects, lapidary material, and mineral collecting; calcite is also important industrially in cement, lime, agriculture, and chemical production. This small tumbled piece typically has modest value.

Geological facts

Calcite reacts vigorously with dilute hydrochloric acid, producing effervescence; vinegar may cause a slower reaction. It is much softer than quartz and can be scratched by a steel knife.

Field identification & locations

Common worldwide, including Mexico, Brazil, the United States, Iceland, and China. Confirm with a hardness test and acid reaction; avoid testing valuable polished specimens.