metamorphic

Quartz-rich mica schist fragment

Muscovite–quartz schist, likely with feldspar and minor iron oxides

AI-generated identification · may be incorrect

Hardness about 2–7 depending on grain; silvery-white, tan, and gray with a sparkly micaceous luster. Platy mica cleavage and granular quartz texture are visible; specific gravity roughly 2.6–2.8.

Identified September 22, 2026More metamorphic →

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Physical properties

Hardness about 2–7 depending on grain; silvery-white, tan, and gray with a sparkly micaceous luster. Platy mica cleavage and granular quartz texture are visible; specific gravity roughly 2.6–2.8.

Formation & geological history

Formed when a clay-rich or feldspathic sedimentary protolith underwent regional metamorphism, producing aligned mica and recrystallized quartz. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used mainly as a decorative or educational specimen; schist may be quarried locally for facing stone, landscaping, and aggregate, but this small fragment has little commercial use.

Geological facts

The glitter comes primarily from muscovite mica, while the hard translucent grains are quartz. Schistosity reflects mineral alignment under directed pressure and heat.

Field identification & locations

Identify it by its foliated, glittery layers, mica flakes that peel into sheets, and quartz grains that resist scratching. Common in metamorphic belts worldwide, including the Appalachians, Alps, and Himalaya.