mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange, pale yellow to deep honey; Luster: Vitreous to resinous; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: Orange, pale yellow to deep honey
Luster: Vitreous to resinous

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Orange, pale yellow to deep honey; Luster: Vitreous to resinous; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Formation & geological history

Formed through sedimentary processes, primarily from the shells of marine organisms or precipitation from calcium-rich groundwater. Found in hydrothermal veins and sedimentary environments globally.

Uses & applications

Primarily used as a decorative stone, in lapidary work for carvings or cabochons, and as a popular specimen for metaphysical collectors. Also used as a source of lime in industrial processes.

Geological facts

Calcite is one of the most common minerals on Earth and is the primary constituent of limestone and marble. It exhibits double refraction (birefringence) and reacts strongly with weak acids like vinegar.

Field identification & locations

Identify in the field by its rhombohedral fracture and its softness (can be scratched by a copper coin). It will bubble when a drop of vinegar is applied. Commonly found in Mexico, Brazil, and the USA.