mineral

Honey calcite specimen

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Pale honey-yellow, translucent, glassy to pearly luster with prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal system, specific gravity about 2.71. The sugary crystalline texture and cream-to-brown matrix are consistent with calcite, though image-based identification is provisional.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by precipitation from carbonate-rich groundwater or hydrothermal fluids, commonly as a cavity or vein mineral; calcite deposits range from recent to hundreds of millions of years old. Common sources include Mexico, Iceland, the United States, and Brazil.

Uses & applications

Used to manufacture cement, lime, aggregate, and agricultural soil amendments; transparent crystals are collected and occasionally used decoratively, but calcite is too soft for most jewelry.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar if freshly powdered or scratched. It commonly shows double refraction and can fluoresce under ultraviolet light depending on impurities.

Field identification & locations

Identify by its softness, rhombohedral cleavage, and acid reaction; avoid confusing it with quartz, which is harder and lacks cleavage. Typical hand specimens sell for about $10-$50, while large, exceptionally clear or fluorescent specimens may reach $100-$300.