metamorphic

Likely green-schist specimen

Greenschist, a chlorite–epidote–actinolite-bearing metamorphic rock

AI-generated identification · may be incorrect

Coarse, irregular rock with green, black, and pale mineral patches and a rough, weakly foliated texture. Likely minerals have Mohs hardness around 2–6; exact composition cannot be confirmed from the image.

Identified October 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when basaltic or other mafic rocks undergo low-grade metamorphism, commonly in ancient oceanic crust or mountain belts. Its age and precise formation history cannot be determined visually.

Uses & applications

Primarily a teaching and collector specimen; some greenschist is used as decorative stone or aggregate.

Geological facts

The green color commonly comes from chlorite, epidote, or actinolite, minerals characteristic of low-grade metamorphism.

Field identification & locations

Look for green minerals and a foliated or schistose texture; the pictured specimen appears consistent with greenschist, but a close examination or mineral tests would be needed for confident identification. Greenschist occurs in metamorphic belts worldwide.