metamorphic

Quartz-bearing mica schist (probable)

Mica schist composed chiefly of quartz and biotite/muscovite mica

AI-generated identification · may be incorrect

Gray to silvery, coarse-grained specimen with sparkling platy mica, translucent vitreous quartz, and strong foliation; quartz is Mohs 7, mica about 2–3, with mica cleavage and quartz lacking cleavage. Specific gravity is typically about 2.7–2.9.

Identified September 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or a felsic sediment undergoes regional metamorphism, recrystallizing under elevated pressure and temperature; commonly Paleozoic to Precambrian, though age depends on locality.

Uses & applications

Used locally as decorative stone, paving, aggregate, and landscaping material; attractive pieces are collected, but this rough specimen has limited commercial value.

Geological facts

The layered texture is schistosity, produced by aligned mica flakes. The pale translucent grains are likely quartz, while the dark reflective flakes are probably biotite.

Field identification & locations

Identify it by its visible foliation, flexible or flaky mica plates, glassy quartz grains, and inability to fizz with dilute acid; distinguish from granite by its pronounced layered fabric. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Scandinavia.