mineral
Raw Calcite
Calcite (Calcium Carbonate - CaCO3)
Mohs hardness of 3, vitreous to waxy luster, trigonal crystal system, perfect rhombohedral cleavage, color ranging from yellowish-brown to tan or grey. It dissolves with effervescence in cold dilute acid.
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Physical properties
Mohs hardness of 3, vitreous to waxy luster, trigonal crystal system, perfect rhombohedral cleavage, color ranging from yellowish-brown to tan or grey. It dissolves with effervescence in cold dilute acid.
Formation & geological history
Forms primarily in sedimentary environments via precipitation from dissolved mineral-rich fluids, as well as in metamorphic settings such as marble and hydrothermal veins.
Uses & applications
Used in construction materials (lime, cement), agriculture (soil treatment), chemical manufacturing, and as ornamental mineral specimens or pocket stones.
Geological facts
Calcite exhibits double refraction (birefringence), where light passing through a transparent crystal splits into two rays, causing images seen through it to appear doubled.
Field identification & locations
Recognized in the field by its low hardness (can be scratched easily with a copper penny or steel blade), soft soapy/waxy tactile feel when rough, and distinct rhombohedral cleavage planes.
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