metamorphic
Banded metamorphic rock, likely mica schist
Mica schist, probably muscovite–biotite schist with quartz and feldspar
AI-generated identification · may be incorrectTypically Mohs 2–3 for mica and 6–7 for quartz; gray-brown, foliated, with a sparkly micaceous luster and aligned platy crystals. Strong schistosity produces the visible layered bands and splits along foliation.
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Physical properties
Typically Mohs 2–3 for mica and 6–7 for quartz; gray-brown, foliated, with a sparkly micaceous luster and aligned platy crystals. Strong schistosity produces the visible layered bands and splits along foliation.
Formation & geological history
Formed when clay-rich sedimentary rock was buried, heated, and compressed during regional metamorphism, commonly during mountain building. Exact geological age cannot be determined from the photograph and depends on locality.
Uses & applications
Used locally as decorative stone, landscaping material, and occasionally building stone; attractive specimens are collected, but this rough piece has little jewelry value.
Geological facts
The shimmering surfaces reflect mica flakes, while lighter bands likely contain quartz and feldspar. Schist commonly represents medium-grade metamorphism between slate/phyllite and gneiss.
Field identification & locations
Identify it by pronounced wavy foliation, visible mica sparkle, and layered texture; it is not usually weakly magnetic. Common in metamorphic mountain belts worldwide, including New England, the Appalachians, Scotland, and the Alps.
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