mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: bright orange to pale yellow; Luster: vitreous to waxy/pearly; Crystal structure: trigonal (often rhombohedral cleavage); Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: bright orange to pale yellow
Luster: vitreous to waxy/pearly

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: bright orange to pale yellow; Luster: vitreous to waxy/pearly; Crystal structure: trigonal (often rhombohedral cleavage); Specific gravity: 2.71

Formation & geological history

Formed through sedimentary processes, often as a precipitate from calcium-rich groundwater in caves or hot springs, or in marine environments. The orange color is typically due to hematite or iron oxide inclusions.

Uses & applications

Used in ornamental carvings, decorative items, lapidary work, and as a calcium source in chemical industries.

Geological facts

Calcite is one of the most common minerals on Earth. It has a unique optical property called double refraction, where light rays are split into two when passing through a clear specimen.

Field identification & locations

Can be identified by its softness (can be scratched by a copper coin) and its reaction to dilute hydrochloric acid (it will effervesce or fizz). Commonly found in Mexico and Brazil.