mineral

Orange calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically honey-orange to peach, translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. Effervesces strongly in dilute hydrochloric acid and is usually nonmetallic.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-rich groundwater precipitates carbonate, and in hydrothermal veins, caves, marbles, and sedimentary limestones. Individual specimens may range from recent deposits to ancient Paleozoic or older host rocks; age cannot be determined from appearance alone.

Uses & applications

Used in cement, lime, agricultural soil treatment, chemical manufacture, and aggregate; attractive transparent pieces are sold as décor or mineral specimens rather than jewelry because of low hardness.

Geological facts

Calcite is one of the most common minerals and shows strong birefringence, producing doubled images through clear pieces. Orange color commonly reflects iron or other trace impurities.

Field identification & locations

Look for rhombohedral cleavage, softness, glassy-to-pearly surfaces, and acid fizz; distinguish it from orange aragonite by cleavage and crystal habit. Common localities include Mexico, Brazil, China, Iceland, and the United States.