metamorphic

Mica-rich schist (likely biotite schist)

Mica schist, composed mainly of biotite and/or muscovite with quartz and feldspar

AI-generated identification · may be incorrect

Glittery, strongly foliated texture with brown-gold mica flakes and darker grains. Mica is Mohs 2–3 with perfect basal cleavage; quartz, if present, is Mohs 7. Exact minerals cannot be confirmed from the photo.

Identified October 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when mica-rich sedimentary or igneous rock underwent heat and pressure, causing minerals to recrystallize and align. Its age and specific formation setting cannot be determined visually.

Uses & applications

Schist is used locally as decorative stone and aggregate; attractive mica-rich pieces are mainly collected as geological specimens.

Geological facts

The visible sparkle likely comes from reflective mica flakes, while the dark grains may be biotite or another accessory mineral.

Field identification & locations

Look for glittering platy minerals and a layered or foliated fabric; schist is common in metamorphic mountain belts worldwide. A hand specimen or mineral tests would be needed for a confident identification.