metamorphic
Greenstone (likely chlorite-rich metamorphic rock)
Chlorite-bearing greenschist; exact identification requires testing
AI-generated identification · may be incorrectSmall, rough, gray-green fragment with a dull to slightly silky luster and fine-grained appearance. Likely Mohs hardness about 2–6 depending on mineral mix; composition and cleavage cannot be determined confidently from the image.
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Physical properties
Small, rough, gray-green fragment with a dull to slightly silky luster and fine-grained appearance. Likely Mohs hardness about 2–6 depending on mineral mix; composition and cleavage cannot be determined confidently from the image.
Formation & geological history
Greenschist forms when mafic rocks are altered by low- to medium-grade metamorphism, commonly in ancient oceanic crust or mountain belts. Its age depends on the source rock and metamorphic event.
Uses & applications
Greenstone is used as crushed aggregate and occasionally as dimension stone; attractive pieces may be collected or carved.
Geological facts
“Greenstone” is a broad field term for green-colored altered rocks, not a single mineral or precise rock composition.
Field identification & locations
The green hue and fine, foliated-looking texture are consistent with chlorite-bearing rock, but visual identification alone is uncertain. Check for foliation, softness, and a green streak; such rocks occur in metamorphic belts worldwide.
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