metamorphic

Foliated metamorphic rock, likely mica schist

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

AI-generated identification · may be incorrect

Moderate-to-coarse foliation with glittering platy mica, pale quartz-rich bands, and darker biotite-rich streaks; mica hardness 2–3, quartz about 7, overall specific gravity roughly 2.7–2.9. The specimen has a silky to vitreous luster and schistosity, but individual minerals are not sufficiently clear for certainty.

Identified September 17, 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 directed pressure during regional metamorphism, commonly during mountain building. Its exact geological age cannot be determined from the photograph; schists range from Precambrian to younger ages.

Uses & applications

Used locally as decorative stone, aggregate, landscaping material, and occasionally roofing or facing stone; attractive mica-rich pieces are collected but are usually low value.

Geological facts

The glitter comes from aligned mica flakes that reflect light. Foliation may split along mica-rich planes, and weathering commonly produces a flaky, crumbly surface.

Field identification & locations

Look for planar alignment of shiny mica, irregular light quartz lenses, and a layered texture; it differs from granite by its strong foliation. Common in regional metamorphic belts worldwide, including mountain regions.