metamorphic

Weathered mica-rich metamorphic rock, likely schist

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

AI-generated identification · may be incorrect

Gray-brown, coarse and sparkly with visible platy mica; uneven foliation and earthy weathering. Hardness is approximately 2–7 depending on mineral, with mica cleavage, quartz/feldspar grains, and generally moderate density.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or another clay-rich sediment was subjected to elevated temperature and pressure, recrystallizing into foliated schist during regional metamorphism. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used locally as crushed aggregate, fill, landscaping stone, and occasionally decorative facing; attractive mica-rich pieces are mainly collector specimens rather than gemstones.

Geological facts

The reflective flakes are likely mica, while the harder gray grains are quartz and feldspar. Strong alignment of mica flakes produces the characteristic schistosity.

Field identification & locations

Look for layers or aligned glittering flakes, easy splitting along foliation, and variable hardness; a streak, acid test, and hand lens would improve identification. Schists occur widely in ancient mountain belts and metamorphic terrains worldwide.