mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 (Mohs scale); Color: Pale orange to deep honey orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 (Mohs scale)
Color: Pale orange to deep honey orange
Luster: Vitreous to waxy

Identified February 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, typically in marine environments as biological precipitates or through chemical precipitation in hydrothermal veins and hot springs.

Uses & applications

Used primarily for ornamental carvings, tumble polishing for crystal collections, as a source of calcium in animal feed, and in the manufacturing of cement and lime.

Geological facts

Calcite exhibits double refraction (birefringence); if you look through a clear piece, objects behind it appear doubled. It is also the primary component of limestone and marble.

Field identification & locations

Identified in the field by its distinctive rhombohedral cleavage and its vigorous reaction (effervescence) when touched with weak hydrochloric acid. Found globally with major deposits in Mexico and Brazil.