metamorphic

Foliated metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

AI-generated identification · may be incorrect

Gray-brown, strongly foliated and sparkly, with platy mica layers and granular quartz/feldspar; individual minerals are commonly Mohs 2–7, while the rock has moderate durability and distinct foliation rather than cleavage.

Identified September 2, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or another clay-rich sediment was buried and subjected to regional metamorphism, typically during mountain building; its exact geological age cannot be determined from the image.

Uses & applications

Used occasionally as decorative stone, landscaping material, and teaching or collecting specimens, but strong foliation limits structural construction use.

Geological facts

The glitter comes mainly from aligned mica flakes; schistosity develops as minerals recrystallize and rotate under directed pressure and heat.

Field identification & locations

Look for visible, aligned flakes that allow the rock to split into rough sheets, unlike massive granite. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalayas.