mineral
Blue Calcite
Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale), Color: Sky blue to pale blue, Luster: Vitreous to waxy/pearly, 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: Sky blue to pale blue, Luster: Vitreous to waxy/pearly, Crystal Structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral in three directions, Specific Gravity: 2.71
Formation & geological history
Formed through sedimentary processes or chemical precipitation in marine environments and hydrothermal veins. It often crystallizes in large masses rather than distinct crystals.
Uses & applications
Commonly used as a decorative stone, lapidary material for carving, and in metaphysical or alternative healing practices. Industrial calcium carbonate is used in cement, antacids, and soil conditioners.
Geological facts
Blue calcite is known for its distinctive 'waxy' texture when handled. It is a very soft mineral, meaning it can be easily scratched by a copper penny or a knife blade.
Field identification & locations
Identify in the field by its pale blue color, rhombic cleavage, and a positive reaction (fizzing) to cold dilute hydrochloric acid. It is primarily found in large deposits in Madagascar and Mexico.
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