mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Honey-orange to bright orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions.

Hardness: 3 on Mohs scale
Color: Honey-orange to bright orange
Luster: Vitreous to waxy

Identified April 5, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Honey-orange to bright orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions.

Formation & geological history

Formed through sedimentary processes or as a primary mineral in igneous and metamorphic rocks. Often precipitates from calcium-rich solutions in caves or hot springs. Common in sedimentary basins worldwide.

Uses & applications

Used in the manufacturing of cement and lime, as a soil conditioner in agriculture, and widely used for decorative carvings, palm stones, and jewelry.

Geological facts

Calcite is one of the most common minerals on Earth. Orange calcite specifically is known for its 'acid-wash' appearance when treated with weak acids to give it a smooth, waxy feel. It is also highly birefringent, meaning it can double refract light.

Field identification & locations

Identified in the field by its distinctive rhombohedral cleavage and its effervescence (bubbling) when in contact with dilute hydrochloric acid. It is much softer than quartz, which it can sometimes resemble. Common locations include Mexico, Utah, and Brazil.