mineral

Orange calcite crystal

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Typically orange to honey-colored, translucent, and vitreous to pearly, with prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.71. The specimen appears to be a small rough cleavage fragment or crystal, possibly with surface coating or iron-oxide coloration.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly precipitates from groundwater and hydrothermal fluids in limestone cavities, veins, and geodes; orange color may result from iron or other trace impurities. It forms from Precambrian to modern geological settings, depending on the deposit.

Uses & applications

Used in cement, lime, aggregate, pigments, and chemical processing; attractive transparent crystals are collected or occasionally used decoratively. It is generally too soft for durable jewelry.

Geological facts

Calcite effervesces strongly in dilute hydrochloric acid and shows birefringence, producing doubled images through clear pieces. Orange calcite is often sold as a lapidary or metaphysical specimen.

Field identification & locations

Identify by its soft hardness, rhombohedral cleavage, and acid reaction; common localities include Mexico, the United States, Iceland, China, and Peru. Avoid confusing it with orange aragonite or fluorite, which differ in cleavage and hardness.