metamorphic

Weathered mica-rich metamorphic rock, likely schist

Muscovite/biotite schist with quartz and feldspar

AI-generated identification · may be incorrect

Visible flaky reflective mica, pale quartz/feldspar patches, and dark foliation; hardness about 2–3 for mica and 6–7 for quartz, with vitreous to pearly luster and strong planar cleavage/foliation.

Identified September 3, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or other clay-rich sediment was subjected to regional metamorphism, typically during mountain building; its exact geological age cannot be determined from the photograph.

Uses & applications

Used locally as decorative stone, landscaping material, aggregate, or roofing in some regions; ordinary pieces have little jewelry value.

Geological facts

The specimen appears heavily weathered and iron-stained, which can produce reddish-brown and dark gray colors. Its layered texture and glittering mica distinguish schist from massive granite.

Field identification & locations

Identify it by thin, roughly parallel mineral layers and mica flakes that split into elastic sheets; common occurrences include mountain belts worldwide, especially the Appalachians, New England, Alps, and Himalaya.