metamorphic

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

AI-generated identification · may be incorrect

Likely Mohs hardness 2–7 depending on mineral; silvery-gold flaky mica produces a sparkling, platy texture, with white-gray quartz/feldspar and brown iron staining. Strong foliation and mica cleavage are apparent, but exact mineralogy cannot be confirmed from a photograph.

Identified September 17, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when a clay-rich sedimentary protolith was subjected to elevated pressure and temperature during regional metamorphism, commonly during mountain building. Its precise geological age and metamorphic grade require field and laboratory analysis.

Uses & applications

Used locally as decorative stone, landscaping material, and occasionally dimension stone; attractive mica-rich pieces are collected but are generally not valuable as gemstones.

Geological facts

The glitter comes from aligned mica flakes reflecting light, and individual flakes may peel along perfect basal cleavage. Schist commonly records the direction of ancient tectonic compression.

Field identification & locations

Look for pronounced foliation, flaky cleavage, and a mixture of light quartz/feldspar with reflective mica; a streak, hardness tests, and thin-section or X-ray analysis would improve identification. Common in metamorphic belts worldwide, including the Appalachians, Alps, and Himalaya.