mineral
Brown Banded Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness of 3, exhibiting distinct brown and white bands with a vitreous to pearly luster and a trigonal crystal system.
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Physical properties
Mohs hardness of 3, exhibiting distinct brown and white bands with a vitreous to pearly luster and a trigonal crystal system.
Formation & geological history
Formed in sedimentary environments through the precipitation of calcium carbonate from mineral-rich waters in caves or hot springs.
Uses & applications
Commonly carved into decorative figurines, ornamental items, and used for lapidary work.
Geological facts
Often marketed commercially as 'Mexican Onyx' or 'Cave Onyx', though it is true calcite rather than actual quartz-based onyx.
Field identification & locations
Identified by its softness, reactivity to dilute hydrochloric acid, and characteristic parallel color banding; sourced globally including Mexico and Pakistan.
