mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale (can be scratched by a copper coin); Color: pale orange to deep amber; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Gravity: 2.71

Hardness: 3 on Mohs scale (can be scratched by a copper coin)
Color: pale orange to deep amber
Luster: Vitreous to waxy

Identified April 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from carbonate-rich fluids in hydrothermal veins or marine environments. It can also be found in metamorphic marble. Orange varieties get their color from iron oxide inclusions.

Uses & applications

Commonly used as an ornamental stone, in metaphysical/alternative healing practices, and as a source of lime in chemical industries. High-quality pieces are often carved or used as collector specimens.

Geological facts

Orange calcite is often treated with a mild acid bath during processing to give it its characteristic 'waxy' or soapy feel, which helps protect the soft surface from fingerprints and moisture.

Field identification & locations

Identify in the field by its rhombohedral cleavage (it breaks into tilted cubes/diamonds) and its reaction to weak acid; it will effervesce (fizz) immediately when exposed to warm diluted hydrochloric acid or vinegar.