metamorphic
Fine-grained greenish-gray rock fragment
Likely greenschist (chlorite–actinolite–epidote assemblage); exact identification requires testing
AI-generated identification · may be incorrectDull to weakly sparkly, granular, green-gray with pale flecks; likely Mohs 5–6, with fine interlocking crystals and no obvious cleavage. Mineral composition cannot be confirmed from the photo.
Identified More metamorphic →
Explore Fine-grained greenish-gray rock fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dull to weakly sparkly, granular, green-gray with pale flecks; likely Mohs 5–6, with fine interlocking crystals and no obvious cleavage. Mineral composition cannot be confirmed from the photo.
Formation & geological history
If greenschist, formed when basaltic rock underwent low-grade metamorphism under heat and pressure; such rocks range widely in geological age.
Uses & applications
Small fragments are mainly useful for collecting or teaching; greenschist is sometimes used as local building or decorative stone.
Geological facts
The green color of greenschist commonly comes from chlorite, actinolite, or epidote. The specimen is too small and visually indistinct to identify reliably from appearance alone.
Field identification & locations
A green, granular texture is suggestive, but check hardness, streak, and mineral grains; location and a fresh broken surface would help distinguish greenschist from other rocks.
More like this
