metamorphic

Foliated metamorphic rock, likely mica schist

Muscovite–biotite schist with quartz and feldspar

AI-generated identification · may be incorrect

Medium- to coarse-grained, gray-green and silvery, with visible glittering mica and weak foliation; likely hardness 2–7 depending on the mineral tested, vitreous to pearly luster, and mica cleavage. The photograph is insufficient for a definitive identification.

Identified September 22, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or another clay-rich sediment was buried and subjected to elevated heat and directed pressure, commonly during mountain building. Its exact geological age cannot be determined visually and depends on the locality.

Uses & applications

Used locally as decorative stone, landscaping material, and occasionally building or roofing stone; attractive pieces may be collected, though this specimen appears of modest gem value.

Geological facts

The sparkly flakes are probably mica, while lighter granular areas are quartz and feldspar; schistosity develops as platy minerals align under pressure.

Field identification & locations

Look for a layered or flaky fabric, mica sparkle, and minerals that separate along foliation; distinguish it from gneiss by its finer, more micaceous texture and from granite by its pronounced planar fabric. Common worldwide in metamorphic mountain belts.