metamorphic
Green Onyx (Bandéd Calcite)
CaCO3 (Calcium Carbonate)
AI-generated identification · may be incorrectMohs hardness of 3; translucent to opaque; vitreous to pearly luster; trigonal crystal system; exhibits strong effervescence in acid.
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Physical properties
Mohs hardness of 3; translucent to opaque; vitreous to pearly luster; trigonal crystal system; exhibits strong effervescence in acid.
Formation & geological history
Formed via the precipitation of carbonate minerals from groundwater in caves, hot springs, or stalagmitic environments.
Uses & applications
Widely used for decorative objects, carvings, interior tiles, and crystal healing practices.
Geological facts
Commercially marketed as green onyx, this stone is actually a banded form of calcite or aragonite rather than true cryptocrystalline quartz onyx.
Field identification & locations
Easily identified by its soft nature, distinct banding, and reaction to hydrochloric acid; sourced globally, notably in Pakistan and Mexico.
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