metamorphic

Likely biotite-rich schist

Mica schist, probably biotite–quartz–feldspar schist

AI-generated identification · may be incorrect

Coarse, glittery silver-gray surface with abundant mica flakes and possible weak foliation. Quartz and feldspar are about Mohs 6–7; mica is about 2–3; exact composition and properties cannot be confirmed from the photo.

Identified October 5, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when clay-rich sedimentary rock or volcanic material was subjected to heat and pressure, recrystallizing into aligned mica and other minerals. Its age depends on the regional metamorphic history and cannot be determined visually.

Uses & applications

Commonly used as decorative or landscaping stone and collected as a specimen; mica-bearing schist has limited use as dimension stone because it can split along foliation.

Geological facts

The reflective sparkle is likely from numerous mica flakes rather than metallic minerals.

Field identification & locations

Look for visible platy grains, glitter, and a tendency to split along aligned layers; similar schists occur in metamorphic mountain belts worldwide. A hand lens or fresh broken surface would help distinguish it from other mica-rich rocks.