Mineral

Orange Calcite

Calcite (CaCO3)

Hardness 3 (Mohs), yellow/orange color, vitreous to pearly luster, rhombohedral crystal structure, perfect cleavage in 3 directions, specific gravity ~2.71

Identified June 19, 2026More mineral →

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Physical properties

Hardness 3 (Mohs), yellow/orange color, vitreous to pearly luster, rhombohedral crystal structure, perfect cleavage in 3 directions, specific gravity ~2.71

Formation & geological history

Formed through precipitation from calcium-rich water in sedimentary environments, or through metamorphism of limestone. Frequently found in hydrothermal veins, caves (as stalactites/stalagmites), and as a primary mineral in marbles.

Uses & applications

Used in the manufacture of cement and concrete, as a soil conditioner, in the optical industry (Iceland Spar), and commonly carved into jewelry or ornamental objects like the pendant shown.

Geological facts

Calcite is one of the most common minerals on Earth. Orange calcite gets its color from iron inclusions. The shape of this object is a traditional Chinese 'bi' disc, often associated with heaven.

Field identification & locations

Identified by its relatively low hardness (can be scratched by a copper penny), perfect rhombohedral cleavage, and it will effervesce (fizz) readily in dilute hydrochloric acid. Common globally, with notable deposits in Mexico.