metamorphic

Mica-rich schist (likely biotite schist)

Mica schist; chiefly quartz and mica, commonly biotite ± muscovite

AI-generated identification · may be incorrect

Coarse, silvery-gray and sparkly with platy minerals and pronounced foliation. Mica is Mohs 2–3 with pearly luster and one perfect cleavage; quartz is Mohs 7. Identification from the photo is provisional.

Identified October 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when clay-rich sedimentary or volcanic rocks were recrystallized under heat and directed pressure, producing aligned mica and schistosity. Its age depends on the source and metamorphic event; the image cannot establish it.

Uses & applications

Used as decorative or landscaping stone and, locally, as dimension stone or aggregate; attractive specimens may be collected, but it is not typically a jewelry gemstone.

Geological facts

Schistosity is the rock’s tendency to split along aligned mica flakes, which create its glittering surface.

Field identification & locations

Look for visible, aligned mica flakes and a foliated texture; quartz-rich layers or other minerals may also occur. Mica schists are widespread in metamorphic belts worldwide.