mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey-orange; Luster: Vitreous to waxy/resinous; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: Pale orange to deep honey-orange
Luster: Vitreous to waxy/resinous

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey-orange; Luster: Vitreous to waxy/resinous; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Formation & geological history

Formed through sedimentary processes or hydrothermal activity. It is a common constituent of sedimentary rocks, often precipitating from calcium-rich solutions in caves or marine environments.

Uses & applications

Primarily used for decorative purposes, lapidary work (cabochons, carvings), and as a collector's mineral. Industrially, calcite is used in lime production and acid neutralization.

Geological facts

Calcite is known for its property of double refraction (birefringence), where light passing through it is split into two rays. It reacts vigorously with dilute hydrochloric acid, producing carbon dioxide gas bubbles.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper penny) and its rhombohedral cleavage. It feels somewhat waxy to the touch compared to quartz. Common in Mexico, Brazil, and the USA.