mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Identified April 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from marine environments or hydrothermal veins. It occurs in various geological ages where calcium-rich waters react with carbon dioxide.

Uses & applications

Used as an ornamental stone, in lapidary work (cabochons and carvings), as a source of lime in industry, and highly popular among mineral collectors and metaphysical practitioners.

Geological facts

Orange calcite is known for its ability to fluoresce under UV light in some specimens. It is one of the most common minerals on Earth, but the bright orange variety is specifically prized for its vibrant hue caused by iron inclusions.

Field identification & locations

Identify in the field by its 3-way rhombohedral cleavage and its reaction (fizzing) when exposed to cold dilute hydrochloric acid. Commonly found in Mexico, Brazil, and the USA (Utah). Collectors should look for its distinctive waxy 'soapy' feel.