mineral

Honey calcite crystal

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically honey-yellow to amber, translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal system, specific gravity about 2.71. The specimen appears naturally crystalline but may be a broken or partially polished fragment.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-rich groundwater or hydrothermal fluids precipitate carbonate in cavities, veins, and sedimentary deposits. Calcite occurs from recent deposits to rocks hundreds of millions of years old.

Uses & applications

Used to manufacture cement, lime, and agricultural soil additives; attractive transparent pieces are sold as decorative or metaphysical specimens. It is generally too soft for durable jewelry.

Geological facts

Calcite effervesces strongly in dilute hydrochloric acid and commonly shows birefringence, producing doubled images through clear pieces. Honey coloration may result from iron or other trace impurities.

Field identification & locations

Common worldwide, including Mexico, Iceland, the United States, and China. Confirm with a hardness test against a copper coin and acid reaction; avoid scratching valuable specimens.