mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale. Color: Bright orange to yellowish-orange. Luster: Vitreous to waxy. Crystal Structure: Trigonal/Rhombohedral. Cleavage: Perfect rhombohedral in three directions. Specific Gravity: 2.71.

Hardness: 3 on Mohs scale
Color: Bright orange to yellowish-orange
Luster: Vitreous to waxy

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily through chemical precipitation in sedimentary environments, hot springs, and hydrothermal veins. The orange color is typically caused by inclusions of hematite or iron oxide during crystal growth.

Uses & applications

Widely used as an ornamental stone, in decorative carvings, lapidary projects, and popular among mineral collectors. Industrial calcite is used in building materials, lime production, and soil conditioning.

Geological facts

Calcite exhibits strong double refraction (birefringence), meaning images viewed through a clear crystal appear doubled. It vigorously effervesces (fizzes) when exposed to cold, dilute hydrochloric acid.

Field identification & locations

Easily identified by its low hardness (can be scratched by a copper coin or steel blade), soft feel, smooth waxy appearance, and strong reaction to acid. Commonly found in Mexico, Peru, Canada, and the USA.