mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange, pale yellow to deep honey; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: Orange, pale yellow to deep honey
Luster: Vitreous to waxy

Identified April 11, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Orange, pale yellow to deep honey; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Formation & geological history

Formed through sedimentary processes or hydrothermal veins. It often precipitates from calcium-rich solutions in caves or hot springs, appearing in massive forms or as rhombohedral crystals.

Uses & applications

Used primarily as decorative carvings, in metaphysical jewelry, as a source of lime in chemical industries, and as an acid neutralizer.

Geological facts

Calcite displays double refraction (Iceland Spar); if you look through a clear piece, objects appear doubled. Orange Calcite specifically gets its color from tiny iron oxide inclusions.

Field identification & locations

Identify in the field by its softness (it can be scratched by a copper penny) and its strong effervescent reaction when exposed to dilute hydrochloric acid (it fizzes). Common locations include Mexico, Brazil, and the USA.