mineral

Honey-brown calcite crystal cluster

Calcite (CaCO₃), likely dogtooth or scalenohedral calcite

AI-generated identification · may be incorrect

Translucent amber-brown crystals with vitreous to resinous luster; Mohs hardness 3, excellent rhombohedral cleavage, trigonal crystal system, and specific gravity about 2.71. The crystals appear clustered and somewhat weathered or coated, so exact identification from the image is tentative.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly precipitates from groundwater or hydrothermal fluids in cavities, veins, and sedimentary limestone environments; specimens may range from ancient to geologically recent. Iron or other impurities can produce the honey-brown color.

Uses & applications

Used industrially in cement, lime, aggregate, glass, and chemical production; attractive crystals are collected as mineral specimens but are generally too soft for jewelry.

Geological facts

Calcite fizzes vigorously with dilute hydrochloric acid or household vinegar, especially on a freshly scratched surface. Its strong cleavage and relatively low hardness distinguish it from quartz.

Field identification & locations

Look for rhombohedral or pointed scalenohedral crystals, easy scratching with a steel nail, and acid effervescence; common localities include Mexico, the United States, China, and Morocco. Avoid abrasion and acids when handling.