metamorphic

Likely mica-rich schist

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

AI-generated identification · may be incorrect

The specimen appears tan-gold and distinctly layered or foliated, with a subtle flaky sheen. Typical mica schist has Mohs hardness around 2–3 for mica-rich surfaces and a crystalline, platy texture; exact properties cannot be confirmed from the image alone.

Identified September 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when clay-rich sedimentary or volcanic rocks undergo regional metamorphism, aligning mica minerals into visible foliation. Its age depends on the source rock and metamorphic event and cannot be determined visually.

Uses & applications

Used as a decorative stone and, when suitable, in landscaping or architectural finishes; mica-bearing specimens are also collected.

Geological facts

Mica flakes split readily into thin sheets, giving schist its characteristic shimmer and layered appearance.

Field identification & locations

Look for visible mica flakes and wavy foliation; common in metamorphic mountain belts worldwide. The image suggests schist, but a close-up or fresh surface would help distinguish it from other foliated rocks.