metamorphic
Greenstone
Metamorphic mafic rock
AI-generated identification · may be incorrectHardness 5-6 on the Mohs scale, greenish color due to chlorite, epidote, or actinolite, with a dull to sub-woody luster and fine-grained, massive structure.
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Physical properties
Hardness 5-6 on the Mohs scale, greenish color due to chlorite, epidote, or actinolite, with a dull to sub-woody luster and fine-grained, massive structure.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks like basalt under high pressure and low temperature conditions.
Uses & applications
Used locally as decorative aggregate, crushed stone for road construction, and occasionally in lapidary work for cabochons.
Geological facts
The green color comes from hydrous iron-magnesium silicates. It is frequently associated with ancient volcanic greenstone belts containing mineral deposits.
Field identification & locations
Identify by its characteristic dull green color, lack of prominent cleavage, and high density. Found worldwide in ancient shield areas and mountain belts.
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