mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey orange; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

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

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey orange; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & geological history

Forms in sedimentary environments through chemical precipitation or as a secondary mineral in igneous and metamorphic rocks. Most orange calcite is found in massive form within limestone deposits or hydrothermal veins.

Uses & applications

Used primarily as decorative carvings, tumbled stones for metaphysical use, lapidary projects, and sometimes as an acid neutralizer in chemical industries.

Geological facts

Calcite is unique for its double refraction property (birefringence). The orange color is typically caused by iron impurities or inclusions of hematite within the crystal lattice.

Field identification & locations

Identify by its orange color, waxy feel, and softness (it can be scratched by a copper penny or steel knife). It will strongly effervesce if exposed to a drop of cold diluted hydrochloric acid. Common locations include Mexico, Brazil, and the USA.