metamorphic

Mica schist

Mica-rich schist, likely muscovite–quartz schist

AI-generated identification · may be incorrect

Silvery-gold, glittering sheen from abundant platy mica; visibly foliated and flaky, with quartz-rich grains. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz is hardness 7. Exact mineral proportions and specific gravity cannot be determined from the photograph.

Identified September 30, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when clay-rich sedimentary rock or shale underwent regional metamorphism, aligning mica into foliation. Its age depends on the locality and cannot be established from appearance alone.

Uses & applications

Used as decorative stone and occasionally for facing or landscaping; mica and quartz-bearing schist is also collected as a specimen. Strong foliation can limit its use as structural stone.

Geological facts

The glitter comes from mica flakes reflecting light, not necessarily from gold. Schistosity is the characteristic layered fabric produced by metamorphic pressure and heat.

Field identification & locations

Look for shiny, aligned flakes and layers that split along foliation; quartz-rich bands may be present. Common in metamorphic mountain belts worldwide; confirm with mineral testing for a precise identification.