mineral

Yellow-orange calcite specimen

Calcite (calcium carbonate, CaCO₃), likely honey or orange calcite

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, yellow-orange color, translucent to semi-opaque, and rhombohedral cleavage; crystal structure is trigonal. The rough, granular appearance is consistent with calcite, though image-only identification is uncertain.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms from precipitation in limestone cavities, hydrothermal veins, caves, and sedimentary environments; deposits range from ancient Precambrian to modern. Orange coloration may result from iron or other trace impurities.

Uses & applications

Used industrially for cement, lime, aggregate, and chemical production; attractive transparent pieces are collected and occasionally carved, but this specimen appears primarily ornamental or collectible.

Geological facts

Calcite strongly effervesces in dilute hydrochloric acid and commonly shows birefringence, producing doubled images through clear pieces. It is softer than a copper coin or knife blade.

Field identification & locations

Common localities include Mexico, Brazil, Iceland, the United States, and China. Confirm with a hardness test, rhombohedral cleavage, and acid reaction; avoid scratching valuable specimens.