metamorphic
Greenstone (likely chlorite-rich metamorphic rock)
Chlorite-rich greenschist; commonly composed of chlorite, actinolite, and epidote
AI-generated identification · may be incorrectPale green-gray, fine-grained, and matte to slightly sparkly; likely Mohs hardness 3–6, depending on mineral mix. The image does not show enough detail to determine its exact mineral composition or structure.
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Physical properties
Pale green-gray, fine-grained, and matte to slightly sparkly; likely Mohs hardness 3–6, depending on mineral mix. The image does not show enough detail to determine its exact mineral composition or structure.
Formation & geological history
Typically forms when basalt or similar mafic rock undergoes low-grade metamorphism in the presence of water. Such rocks occur in ancient metamorphic belts of many ages.
Uses & applications
Mostly collected as a specimen or used as decorative stone; greenstone varieties have also been used historically for tools and ornaments.
Geological facts
“Greenstone” is a descriptive field term, not a single mineral or precisely defined rock; color alone cannot confirm the identification.
Field identification & locations
The rough, greenish, granular specimen is consistent with greenstone, but a close-up and hardness or mineral tests would be needed to identify it confidently. Similar rocks occur in metamorphic regions worldwide.
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