metamorphic

Mica-rich schist (likely quartz-mica schist)

Quartz–mica schist; chiefly quartz with muscovite and/or biotite

AI-generated identification · may be incorrect

Gray-beige, sparkly, and visibly foliated, with rusty-brown iron-oxide staining. Quartz is Mohs 7; mica is about 2–3; the rock has a crystalline texture and splits along mica-rich planes. Exact composition cannot be confirmed from the photograph.

Identified September 27, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or other clay-rich sediment was buried and regionally metamorphosed under heat and pressure, aligning mica into foliation. Its age depends on the source region and cannot be determined from appearance alone.

Uses & applications

Schist is used as decorative or landscaping stone and sometimes as a building stone; mica and quartz are also industrial materials. This rough specimen appears mainly suited to collecting or display.

Geological facts

The glitter comes from reflective mica flakes; the rusty markings likely represent iron-bearing minerals altered by weathering.

Field identification & locations

Look for a sparkly, platy texture and foliation that allows splitting; common in mountain belts and metamorphic terrains worldwide. Approximate value: $2–$15 for an ordinary hand specimen.