metamorphic

Mica-rich schist (likely mica schist)

Mica schist, composed chiefly of muscovite and/or biotite mica with quartz; exact minerals require testing

AI-generated identification · may be incorrect

Golden-brown, strongly glittering, foliated texture suggests abundant mica flakes. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz, if present, is hardness 7. Overall specimen properties vary with composition.

Identified October 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when clay-rich or other sedimentary/igneous rocks are metamorphosed under heat and pressure, aligning mica into layers. Its age and source locality cannot be determined from the image.

Uses & applications

Mica schist is mainly a collectible or teaching specimen; mica itself is used in electrical insulation, fillers, and cosmetics, while sound schist may be used locally as decorative stone.

Geological facts

The shimmering surface comes from light reflecting off many platy mica crystals, a hallmark of schistosity.

Field identification & locations

Look for visible, aligned mica flakes and a tendency to split along foliation; distinguish it from massive mica-bearing rocks by its layered texture. Common in metamorphic belts worldwide; confirm with hardness and mineral tests.