metamorphic
Greenstone
Metamorphic mafic rock
AI-generated identification · may be incorrectHardness 5-6 on the Mohs scale, greenish color due to chlorite and epidote, dull to sub-vitreous luster, and fine-grained crystalline structure.
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Physical properties
Hardness 5-6 on the Mohs scale, greenish color due to chlorite and epidote, dull to sub-vitreous luster, and fine-grained crystalline structure.
Formation & geological history
Formed through low-grade regional metamorphism of basaltic volcanic rocks under elevated pressure and temperature.
Uses & applications
Used historically for stone axes and ornaments, and locally as decorative aggregate or landscaping stone.
Geological facts
The green color comes from secondary minerals like chlorite, actinolite, and epidote replacing original pyroxenes.
Field identification & locations
Identify by its distinct green hue and fine-grained texture; commonly found in ancient shield areas and mountain belts.
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