mineral
Calcite
Calcium Carbonate (CaCO3)
Hardness: 3 on Mohs scale; Color: Variable (white/pink/clear); Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Fluorescence: Strong under UV light.
- Hardness
- 3 on Mohs scale
- Color
- Variable (white/pink/clear)
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: Variable (white/pink/clear); Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Fluorescence: Strong under UV light.
Formation & geological history
Formed through sedimentary processes in marine environments, as chemical precipitates from groundwater (stalactites), or in hydrothermal veins and metamorphic marbles. Found throughout geological history.
Uses & applications
Used in the manufacture of cement, lime, and glass, as an agricultural soil neutralizer, and as decorative specimens or metaphysical stones.
Geological facts
Calcite is famous for its strong double refraction (birefringence) and its diverse range of fluorescent colors under ultraviolet light depending on trace impurities.
Field identification & locations
Identified by its rhombohedral cleavage and its vigorous effervescence (bubbling) when in contact with cold dilute hydrochloric acid. Commonly found in limestone and marble deposits.
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Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
Granite
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