metamorphic

Likely mica schist

Mica-rich schist, probably muscovite–biotite schist

AI-generated identification · may be incorrect

Coarse, unevenly foliated rock with reflective flakes and a gray-brown color. Mica has Mohs hardness about 2–3; associated quartz and feldspar are about 6–7. The photo does not show enough detail to confirm its minerals or exact identification.

Identified October 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when clay-rich sedimentary or igneous rock is altered by heat and pressure, aligning mica into visible layers. Its age cannot be determined from appearance alone.

Uses & applications

Schist is used locally as decorative stone, landscaping material, and occasionally building stone; mica-bearing specimens are mainly collected for display.

Geological facts

The glittering surface is likely from mica flakes reflecting light; schistosity is the characteristic planar texture produced by aligned platy minerals.

Field identification & locations

Look for visible mica, wavy foliation, and a tendency to split along mineral-rich layers; distinguish it from similarly glittery gneiss by schist’s stronger mica alignment. Mica schists occur in metamorphic belts worldwide.