metamorphic

Likely mica-rich metamorphic rock (schist)

Mica schist, probably biotite–muscovite schist; exact identification requires closer examination

AI-generated identification · may be incorrect

Coarse, gray-brown and visibly flaky or sparkly, consistent with mica; mica has Mohs hardness 2–3 and platy cleavage. The specimen’s overall hardness, composition, and density cannot be determined reliably from the photo.

Identified September 30, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when clay-rich sedimentary rock was buried and altered by heat and pressure, aligning mica into a foliated texture. Its age and precise formation setting cannot be inferred from the image.

Uses & applications

Mica schist is sometimes used as decorative stone, landscaping material, or a teaching and collecting specimen; this small rough piece has no evident gem use.

Geological facts

Schist is a texture-defined metamorphic rock, commonly containing mica and quartz, and can vary substantially in composition.

Field identification & locations

Look for thin, reflective mica flakes and a layered or foliated fabric; distinguish it from mica-bearing igneous rock by foliation. Schist occurs in regional metamorphic belts worldwide.