mineral
Orange Calcite
Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale), Color: pale orange to honey yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral in three directions, Specific Gravity: 2.71
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Physical properties
Hardness: 3 (Mohs scale), Color: pale orange to honey yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral in three directions, Specific Gravity: 2.71
Formation & geological history
Formed primarily through sedimentary processes by chemical precipitation from calcium-rich solutions, or in metamorphic environments as marble. It can be found in a variety of geological settings from cave deposits to marine sediments.
Uses & applications
Used as an ornamental stone, for carving, as a source of lime in cement production, and as a popular metaphysical or decorative specimen for collectors.
Geological facts
Calcite is famous for its double refraction property and its ability to react vigorously with dilute hydrochloric acid. Orange varieties are often color-enhanced by impurities like iron oxide or hematite.
Field identification & locations
Identified in the field by its rhombohedral cleavage, its softness (can be scratched by a copper coin or a knife), and its effervescence when exposed to weak acid. Common worldwide, with significant deposits in Mexico, Brazil, and the USA.
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sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
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Mineral/Rock