metamorphic
Greenstone (likely chlorite-rich metamorphic rock)
Chlorite-rich greenschist; exact identification requires testing
AI-generated identification · may be incorrectPale green-gray, dull to subtly shiny, fine-grained and massive with uneven fracture. Likely hardness about 2–4.5 Mohs; chlorite has platy crystals, but individual crystals are not clear in the image.
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Physical properties
Pale green-gray, dull to subtly shiny, fine-grained and massive with uneven fracture. Likely hardness about 2–4.5 Mohs; chlorite has platy crystals, but individual crystals are not clear in the image.
Formation & geological history
Typically forms when basalt or other mafic rock is metamorphosed under low-grade, water-rich conditions. Such rocks occur across many geological ages, so age cannot be determined from appearance alone.
Uses & applications
Greenstone is used as decorative or landscaping stone and, when sound, for aggregate or dimension stone; attractive pieces may be collected or carved.
Geological facts
“Greenstone” is a broad field term for green-colored rocks, not a single mineral or precise rock type; color commonly comes from chlorite, epidote, or actinolite.
Field identification & locations
The specimen’s green color and fine, granular texture fit greenstone, but visual identification is uncertain. Check for softness and platy chlorite grains; greenstone occurs in metamorphic belts worldwide.
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