metamorphic
Mica schist fragment
Biotite–quartz–feldspar schist
AI-generated identification · may be incorrectTypically Mohs 2.5–7 depending on mineral; glittery black-brown biotite, translucent white quartz, and tan/white feldspar show strong foliation and mica cleavage. It has a vitreous to pearly luster and variable specific gravity around 2.7–3.0.
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Physical properties
Typically Mohs 2.5–7 depending on mineral; glittery black-brown biotite, translucent white quartz, and tan/white feldspar show strong foliation and mica cleavage. It has a vitreous to pearly luster and variable specific gravity around 2.7–3.0.
Formation & geological history
Formed when shale or another 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 facing; attractive pieces are collected but generally have little gem value.
Geological facts
The dark, sparkly layers are biotite mica, which splits into thin elastic sheets and records metamorphic alignment.
Field identification & locations
Identify it by its flaky, layered texture, visible mica sparkle, and tendency to split along foliation; common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalayas.
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