mineral

Peach/orange calcite crystal

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, translucent peach-orange color, rhombohedral cleavage, and trigonal crystal structure; the blocky form and prominent cleavage fit calcite.

Identified August 22, 2026More mineral →

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Physical properties

Typically Mohs hardness 3, vitreous to pearly luster, translucent peach-orange color, rhombohedral cleavage, and trigonal crystal structure; the blocky form and prominent cleavage fit calcite.

Formation & geological history

Forms in limestone, hydrothermal veins, caves, and sedimentary cavities through precipitation from calcium-rich fluids. Individual crystals may range from recent deposits to hundreds of millions of years old.

Uses & applications

Used industrially for cement, lime, aggregate, soil treatment, and chemical production; clear or colorful crystals are sold as inexpensive collector specimens and occasionally carved ornaments.

Geological facts

Calcite effervesces strongly in dilute hydrochloric acid and commonly shows double refraction when clear. Orange coloration may result from iron or other trace impurities.

Field identification & locations

Identify it by its softness, rhombohedral cleavage, and vigorous acid reaction; it is commonly found worldwide, including Mexico, the United States, Iceland, and China. Avoid scratching polished surfaces.