mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey-orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions.

Hardness: 3 on Mohs scale
Color: Pale orange to deep honey-orange
Luster: Vitreous to waxy

Identified May 30, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey-orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions.

Formation & geological history

Formed through sedimentary processes or as a secondary mineral in igneous rocks via hydrothermal activity. It often precipitates from calcium-rich solutions in caves or marine environments.

Uses & applications

Used as an ornamental stone, in decorative carvings, as a source of calcium in the chemical industry, and widely collected by mineral enthusiasts for its vibrant color.

Geological facts

Calcite is famous for its double refraction property. Orange calcite specifically gets its warm hue from inclusions of hematite or iron oxides trapped during formation.

Field identification & locations

Identify by its relatively low hardness (can be scratched by a copper coin) and its rapid effervescence when exposed to a drop of weak acid. Commonly found in Mexico, Brazil, and the USA.