mineral
Orange Calcite
Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale), Color: Orange to pale yellow, Luster: Vitreous to waxy, Crystal structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral
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Physical properties
Hardness: 3 (Mohs scale), Color: Orange to pale yellow, Luster: Vitreous to waxy, Crystal structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral
Formation & geological history
Forms primarily through chemical precipitation in sedimentary environments such as marine basins or hot springs; can also occur in hydrothermal veins.
Uses & applications
Used for decorative carvings, lapidary arts, jewelry, and as an ornamental 'healing stone' in alternative medicine. Specifically used in industry as an acid neutralizer.
Geological facts
Calcite is the most stable polymorph of calcium carbonate and exhibits double refraction, where light entering the crystal is split into two rays.
Field identification & locations
Can be identified in the field by its rhombohedral cleavage and its vigorous reaction (effervescence) when touched with dilute hydrochloric acid.
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