mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale orange to honey yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

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

Identified March 8, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale orange to honey yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & geological history

Formed through chemical precipitation from calcium-rich solutions in sedimentary environments or as a secondary mineral in hydrothermal veins. Often found in limestone caves or marine deposits.

Uses & applications

Primarily used for lapidary work, ornamental carvings, and as a collector's specimen. In industry, calcite is used in the manufacture of cement, glass, and as an acid neutralizer.

Geological facts

Orange calcite is known for its 'soapy' or waxy feel compared to quartz. It exhibits double refraction (birefringence), where light passing through it splits into two rays, often making text underneath look doubled.

Field identification & locations

Identify in the field by its softness (it can be scratched by a copper penny) and its reaction to cold dilute hydrochloric acid, which causes it to effervesce (fizz) immediately. Commonly found in Mexico, Brazil, and the USA.