metamorphic
Greenstone
Metabasalt
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, green coloration due to chlorite and epidote, dull to sub-vitreous luster, and a fine-grained crystalline structure.
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Physical properties
Hardness of 5-6 on the Mohs scale, green coloration due to chlorite and epidote, dull to sub-vitreous luster, and a fine-grained crystalline structure.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks like basalt under high pressure and low temperatures.
Uses & applications
Historically used by indigenous peoples for stone axes and adzes, and occasionally as a decorative or lapidary stone.
Geological facts
The green color comes from secondary minerals like chlorite, actinolite, and epidote that replace the original pyroxenes and calcic plagioclase.
Field identification & locations
Identified by its distinctive greenish hue and dense, fine-grained texture; commonly found in ancient shield areas and greenstone belts.
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