sedimentary
Banded Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, features distinct orange, brown, and white bands with a vitreous to pearly luster and trigonal crystal structure.
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Physical properties
Hardness of 3 on Mohs scale, features distinct orange, brown, and white bands with a vitreous to pearly luster and trigonal crystal structure.
Formation & geological history
Formed through the chemical precipitation of calcium carbonate from mineral-rich waters in caves or hot springs over thousands of years.
Uses & applications
Widely used for ornamental carvings, decorative home decor items, and as collector display specimens.
Geological facts
Often commercially and incorrectly referred to as 'onyx' or 'Mexican onyx' due to its layered appearance, though true onyx is a microcrystalline quartz.
Field identification & locations
Identified by its characteristic warm-toned banding and its strong effervescence when tested with dilute hydrochloric acid.
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