metamorphic

Mica-rich metamorphic rock, likely schist

Quartz–mica schist; commonly quartz with muscovite and/or biotite mica

AI-generated identification · may be incorrect

Gray to silvery, strongly sparkly and foliated, with platy reflective mica grains and irregular fracture; typical hardness is about 2–7 depending on the minerals, with mica near 2–3 and quartz near 7. The specimen appears coarse-grained and lacks visible crystal faces, so exact identification is uncertain from the imag…

Identified September 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or another clay-rich sediment is subjected to elevated heat and pressure during regional metamorphism, commonly during mountain building. Its precise geological age cannot be determined visually and may range from Precambrian to much younger.

Uses & applications

Used locally as decorative stone, aggregate, landscaping material, and occasionally wall or roofing stone; attractive mica-rich pieces are collected but are generally not gem material.

Geological facts

The glitter comes from mica cleavage surfaces reflecting light, not necessarily from precious metal. Schistosity develops as platy minerals align under directed pressure.

Field identification & locations

Look for layered or wavy foliation, abundant glittering mica, and flakes that may peel from the surface; a glass scratch test can reveal quartz-rich areas. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalaya.