metamorphic
Fine-grained metamorphic rock, likely slate or phyllite
Slate/phyllite; composition commonly quartz, mica, and chlorite
AI-generated identification · may be incorrectBrown-gray, fine-grained, with a subtle sheen and possible foliation; likely Mohs hardness 3–5. The image does not show enough detail to confirm cleavage or distinguish slate from phyllite.
Identified More metamorphic →
Explore Fine-grained metamorphic rock, likely slate or phyllite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Brown-gray, fine-grained, with a subtle sheen and possible foliation; likely Mohs hardness 3–5. The image does not show enough detail to confirm cleavage or distinguish slate from phyllite.
Formation & geological history
Formed when clay-rich sedimentary rock was altered by low-grade heat and pressure during metamorphism; its age and precise formation environment cannot be determined from the image.
Uses & applications
Slate is used for roofing, paving, and tiles; phyllite is mainly a decorative or collectible stone.
Geological facts
A silky sheen from aligned fine mica distinguishes phyllite from the typically duller surface of slate.
Field identification & locations
Look for planar layers and whether the specimen splits into thin sheets; slate tends to split cleanly, while phyllite has a satiny sheen and wavy surfaces. Similar rocks occur in metamorphic belts worldwide.
More like this
