mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 (Mohs scale); Color: Pale orange to deep honey orange; Luster: Vitreous to waxy; Crystal System: Trigonal; 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 June 30, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through sedimentary processes, often as chemical precipitates from calcium-rich waters or in hydrothermal veins. It can be found in limestone caves and large massive deposits formed millions of years ago.

Uses & applications

Used primarily in lapidary work for carvings and spheres, as decorative specimens, in the production of cement, and as a source of calcium in agriculture.

Geological facts

Calcite is one of the most common minerals on Earth. Orange calcite specifically gets its color from iron impurities. It is famous for its double refraction (birefringence) property.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper coin) and its effervescence (bubbling) when in contact with weak acids like vinegar. Common in Mexico, Brazil, and the USA.