mineral

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Hardness: 3 on Mohs scale; Color: pale orange to deep 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: pale orange to deep orange
Luster: Vitreous to waxy

Identified February 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes or hydrothermal activity. Most orange calcite specimens are found in massive form within limestone or marble deposits where iron impurities provide the orange hue.

Uses & applications

Primarily used as decorative stones, in lapidary work (cabochons and carvings), and as metaphysical stones. In industry, calcite is used for cement, agricultural lime, and glass manufacturing.

Geological facts

Orange calcite is often treated with a mild acid wash to give it a smooth, waxy finish for collectors. Calcite is known for its property of double refraction (birefringence), where light passing through it splits into two rays.

Field identification & locations

Identify in the field by its rhombohedral cleavage, softness (can be scratched by a copper coin), and strong effervescence (bubbles) when touched with dilute hydrochloric acid. Commonly found in Mexico, Brazil, and the USA.

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