metamorphic

Likely mica schist fragment

Mica-rich schist, chiefly muscovite/biotite with quartz and feldspar

AI-generated identification · may be incorrect

Small, elongated fragment with silvery reflective flakes, gray-brown color, and pronounced foliation. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz is harder (7) and vitreous. Specific gravity is roughly 2.7–3.0.

Identified September 5, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or other clay-rich sediment was regionally metamorphosed under elevated pressure and temperature, commonly during mountain building. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used locally as decorative stone, landscaping material, and occasionally building stone; attractive mica-rich pieces are collected but generally have low commercial value.

Geological facts

The glittering surfaces are likely mica cleavage planes rather than metallic luster. Individual flakes may peel into thin elastic sheets, a diagnostic mica property.

Field identification & locations

Common in metamorphic terrains and road cuts, especially around ancient mountain belts. Look for strong planar layering, sparkly flakes, and easy splitting along foliation; a photo alone cannot exclude weathered phyllite or mica-bearing quartzite.