metamorphic

Probable mica schist

Schist, likely muscovite–biotite schist

AI-generated identification · may be incorrect

Coarse, flaky texture with visible mica, gray-brown color, and pearly to vitreous luster; mica hardness is about 2–3 Mohs, while the rock matrix is typically 5–7. Strong foliation allows splitting along mica-rich layers; identification is tentative because the image is low-resolution.

Identified August 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or other clay-rich sedimentary rock underwent regional metamorphism, commonly during mountain building. Ages vary widely, from Precambrian to younger orogenic belts.

Uses & applications

Used locally as decorative stone, landscaping material, and occasionally building facing; attractive mica-rich pieces are mainly collected as specimens rather than used as gemstones.

Geological facts

The glittering flakes are likely mica, whose perfect basal cleavage produces the characteristic layered appearance.

Field identification & locations

Look for aligned, shiny mica flakes and planar splitting; common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalayas. A fresh surface, hardness tests, and inspection for garnet or quartz would improve identification.