mineral
Calcite
Calcium carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness 3, vitreous to pearly luster, perfect rhombohedral cleavage in three directions, and specific gravity around 2.71.
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Physical properties
Mohs hardness 3, vitreous to pearly luster, perfect rhombohedral cleavage in three directions, and specific gravity around 2.71.
Formation & geological history
Formed through chemical or biochemical precipitation in sedimentary environments, or hydrothermally in veins and metamorphic marbles.
Uses & applications
Used in the manufacturing of cement, lime, soil conditioners, optical instruments, and as an industrial filler.
Geological facts
Calcite strongly effervesces (fizzes) in dilute hydrochloric acid and clear varieties display double refraction.
Field identification & locations
Identify in the field by its scratchability with a copper penny (Mohs 3), rhombohedral cleavage, and reaction to weak acid. Extremely common worldwide.
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Septarian Pebble
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