mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Mohs hardness of 3, soft and easily scratched by a copper coin. Shows distinct rhombohedral cleavage, vitreous to waxy luster, orange to yellowish-orange translucent color, and white streak.
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Physical properties
Mohs hardness of 3, soft and easily scratched by a copper coin. Shows distinct rhombohedral cleavage, vitreous to waxy luster, orange to yellowish-orange translucent color, and white streak.
Formation & geological history
Forms primarily through chemical precipitation in sedimentary environments, hot springs, and hydrothermal vein systems.
Uses & applications
Popular for decorative carvings, lapidary projects, crystal healing collections, and as an industrial source of lime and cement when mined in bulk.
Geological facts
Calcite displays double refraction (birefringence), meaning light passing through a clear specimen splits into two rays. Orange calcite owes its warm hue to traces of iron oxide or hematite inclusions.
Field identification & locations
Identified in the field by its low hardness (3 on Mohs scale), rhombohedral cleavage planes, and strong effervescence (fizzing) when exposed to cold dilute hydrochloric acid. Commonly found in Mexico, Brazil, Peru, and the USA.
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