mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange to reddish-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: Orange to reddish-orange
Luster: Vitreous to waxy

Identified April 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from marine environments or concentrated by hydrothermal activity. Can be found in massive form or as rhombohedral crystals.

Uses & applications

Used primarily for ornamental purposes, lapidary work (cabochons), as a source of calcium in animal feed, and in the metaphysical/collecting market.

Geological facts

Orange calcite gets its distinct hue from iron inclusions. It is one of the most common minerals on Earth but varied in color due to impurities. It will react and effervesce (fizz) when in contact with weak hydrochloric acid.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper coin) and its reaction to acid. Often found in limestone-rich areas or as vein fillings.