sedimentary
Bandized Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness of 3, exhibiting distinctive parallel color bands, vitreous to dull luster, and trigonal crystal structure with perfect cleavage.
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Physical properties
Mohs hardness of 3, exhibiting distinctive parallel color bands, vitreous to dull luster, and trigonal crystal structure with perfect cleavage.
Formation & geological history
Formed through the chemical precipitation of calcium carbonate from mineral-rich waters in caves, hot springs, or fracture fillings.
Uses & applications
Widely used for ornamental objects, decorative slabs, carvings, and polished display specimens.
Geological facts
Often commercialized incorrectly as "Mexican onyx" or "cave onyx," though it is chemically calcite rather than true quartz onyx.
Field identification & locations
Identified easily by its distinctive banding, relative softness, and vigorous effervescence when tested with hydrochloric acid.
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