sedimentary
Green Onyx
Banding calcite (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, waxy to vitreous luster, displays distinctive parallel bands of green, white, and brown.
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Physical properties
Hardness of 3 on the Mohs scale, waxy to vitreous luster, displays distinctive parallel bands of green, white, and brown.
Formation & geological history
Formed as a stalagmitic limestone in caves or hot spring deposits over thousands of years.
Uses & applications
Widely used in decorative carvings, luxury interior design, and polished ornamental objects like this carved cube.
Geological facts
Commercial green onyx is technically banded calcite or marble rather than true cryptocrystalline quartz onyx.
Field identification & locations
Identified by its softness (easily scratched by a knife) and effervescence when exposed to dilute hydrochloric acid.
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