mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale yellow to deep orange; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.71.

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

Identified March 23, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale yellow to deep orange; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.71.

Formation & geological history

Forms primarily through sedimentary processes when calcium-rich water evaporates or through hydrothermal circulation in rock fractures. It is found in massive form or as rhombohedral crystals, often associated with limestone and marble.

Uses & applications

Used in the manufacture of lime and cement, as an acid neutralizer in the chemical industry, in optical instruments, and commonly as decorative stones or metaphysical healing 'charging' stones.

Geological facts

Calcite is one of the most common minerals on Earth. Orange calcite specifically gets its color from tiny inclusions of hematite or iron oxides. It exhibits double refraction, where light rays are split into two as they pass through the crystal.

Field identification & locations

Identify in the field by its 3-way rhombohedral cleavage and its vigorous 'fizzing' reaction when exposed to cold dilute hydrochloric acid. It is soft enough to be scratched by a copper penny. Common locations include Mexico, Brazil, and the USA.