mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange to honey-yellow; Luster: Vitreous to waxy/greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Orange to honey-yellow
Luster: Vitreous to waxy/greasy

Identified July 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sedimentary environments through chemical precipitation from calcium-rich solutions, or in hydrothermal veins. Common in limestone and marble formations across various geological ages.

Uses & applications

Used primarily for ornamental purposes, lapidary carvings, decorative stones, and as a popular specimen for gemstone collectors and metaphysical enthusiasts.

Geological facts

Calcite is one of the most common minerals on Earth. The orange variety gets its distinct color from tiny inclusions of iron oxide (hematite) or other organic materials.

Field identification & locations

Easily identified in the field by its 3-way rhombohedral cleavage and its rapid effervescence when exposed to cold dilute hydrochloric acid. Commonly found in Mexico, Brazil, and the USA (Utah).