mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale orange to honey; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive in carvings); Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

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

Identified May 23, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale orange to honey; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive in carvings); Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & geological history

Forms through chemical precipitation in sedimentary environments, often in marine settings, caves (as speleothems), or hydrothermal veins. Found in deposits ranging from ancient Paleozoic to modern formations.

Uses & applications

Used primarily for decorative carvings, gemstones, and architectural ornaments. In industry, calcite is used for lime, cement, and chemical neutralizers.

Geological facts

Calcite is one of the most common minerals on Earth. Orange varieties get their color from hematite inclusions or slight chemical impurities. It exhibits double refraction (birefringence) when clear.

Field identification & locations

Identify in the field by its softness (it can be scratched by a copper coin) and its immediate effervescence when exposed to dilute hydrochloric acid. Commonly found in Mexico and Brazil.