mineral

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Hardness: 3 on Mohs scale. Color: Pale to deep orange with white veining. Luster: Vitreous to waxy. Crystal Structure: Trigonal. Cleavage: Perfect rhombohedral. Specific Gravity: 2.71.

Hardness: 3 on Mohs scale
Color: Pale to deep orange with white veining
Luster: Vitreous to waxy

Identified July 3, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale. Color: Pale to deep orange with white veining. Luster: Vitreous to waxy. Crystal Structure: Trigonal. Cleavage: Perfect rhombohedral. Specific Gravity: 2.71.

Formation & geological history

Formed through sedimentary processes or hydrothermal activity. Often found in large masses in limestone caves or near hot springs. Common in deposits from the Triassic to Cretaceous periods.

Uses & applications

Primary source of lime for cement, used as a flux in steel manufacture, as an ornamental stone in jewelry (cabochons), and highly popular in the metaphysical and specimen collecting communities.

Geological facts

Orange calcite is often given an acid bath by dealers to give it a smooth, waxy feel. It is one of the most common minerals on Earth, but the bright orange variety is particularly sought after for its vibrant color.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper penny) and its reaction to dilute hydrochloric acid (it will fizz). Commonly found in Mexico, Brazil, and the USA (Utah). Tips for collectors: store away from harder stones to prevent scratching.