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; Gravity: 2.71

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

Identified July 4, 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; Gravity: 2.71

Formation & geological history

Formed through chemical precipitation in sedimentary environments, hydrothermal veins, or as a constituent of metamorphic marble.

Uses & applications

Used primarily in lapidary work for carvings, decorative stones, and jewelry, as well as a source of calcium in industrial chemical processes.

Geological facts

Orange calcite is known for its property of double refraction; if you look through a clear specimen, you will see two of everything. It also reacts strongly (fizzing) to weak acids like vinegar.

Field identification & locations

Identified by its relatively low hardness (can be scratched by a copper coin) and rhombohedral cleavage. Commonly found in Mexico, Brazil, and the USA. Collectors look for vibrant, saturated orange hues.