mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange, peach, to yellowish-orange; Luster: Vitreous to waxy/pearly; Crystal System: Trigonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Orange, peach, to yellowish-orange
Luster: Vitreous to waxy/pearly

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms through chemical precipitation in sedimentary marine environments, hot springs, or as vein minerals in hydrothermally altered rock formations. Orange coloration is caused by tiny inclusions of hematite or iron oxide during crystal growth.

Uses & applications

Popular among mineral collectors and used in ornamental carvings, decorative stones, and metaphysical practices. Industrial calcite is used in building materials, cement, and soil treatment.

Geological facts

Calcite exhibits double refraction (birefringence), meaning light passing through a clear specimen splits into two rays, causing images seen through it to appear doubled. It also reacts strongly by effervescing (fizzing) when exposed to cold dilute acid.

Field identification & locations

Identified by its softness (can be scratched by a copper penny or steel blade), distinct rhombohedral cleavage planes, waxy texture, and reaction to acid. Common locations include Mexico, Brazil, Peru, and the USA.