metamorphic
Greenstone (likely chlorite-rich metamorphic rock)
Chlorite-bearing greenschist; exact identification requires testing
AI-generated identification · may be incorrectOpaque, gray-green, rough and irregular with pale weathered patches. Likely dominated by chlorite and other altered mafic minerals; hardness and luster cannot be reliably determined from the image alone.
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Physical properties
Opaque, gray-green, rough and irregular with pale weathered patches. Likely dominated by chlorite and other altered mafic minerals; hardness and luster cannot be reliably determined from the image alone.
Formation & geological history
Typically forms when basalt or other mafic igneous rock undergoes low-grade metamorphism and hydration. Such rocks occur in ancient metamorphic belts; the specimen’s age and specific formation are unknown.
Uses & applications
Commonly collected as a field specimen and sometimes used as decorative stone or aggregate; this piece does not appear gem-quality.
Geological facts
“Greenstone” is a broad field term for green-hued, altered mafic rocks, not a single mineral or precise rock type.
Field identification & locations
Green color and massive, fine-grained appearance are consistent with chlorite-rich rock, but visual identification is uncertain; hardness, streak, and thin-section tests can help distinguish it from serpentinite or other green rocks. Found in metamorphic terrains worldwide.
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