metamorphic
Likely chlorite schist
Chlorite-rich schist; chiefly chlorite with possible quartz and mica
AI-generated identification · may be incorrectDark green to gray, dull to slightly silky luster, foliated and flaky; hardness roughly 2–4 Mohs. Exact mineral composition cannot be confirmed from the image.
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Physical properties
Dark green to gray, dull to slightly silky luster, foliated and flaky; hardness roughly 2–4 Mohs. Exact mineral composition cannot be confirmed from the image.
Formation & geological history
Forms when magnesium- and iron-rich rocks undergo low-grade regional metamorphism. Such rocks occur in many ancient metamorphic belts; the specimen’s age and precise origin are not identifiable visually.
Uses & applications
Commonly collected as a specimen and sometimes used as decorative stone or landscaping material; typically has little commercial value.
Geological facts
The green color is commonly caused by chlorite, a group of sheet silicate minerals. Schistosity reflects minerals aligned under heat and pressure.
Field identification & locations
Look for green color and a layered texture that splits along aligned flakes; chlorite schist is found in metamorphic terrains worldwide. Confirming the identification requires examining a fresh surface or testing its minerals.
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