metamorphic
Mica-rich schist (likely biotite–muscovite schist)
Mica schist; composed chiefly of muscovite and/or biotite with quartz and feldspar
AI-generated identification · may be incorrectVisible glittering, flaky mica and wavy foliation suggest schist. Mica hardness is about 2–3 Mohs and quartz about 7; overall color is brown, gold, and dark gray, with a shiny platy luster and no single crystal structure or specific gravity for the mixed rock.
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Physical properties
Visible glittering, flaky mica and wavy foliation suggest schist. Mica hardness is about 2–3 Mohs and quartz about 7; overall color is brown, gold, and dark gray, with a shiny platy luster and no single crystal structure or specific gravity for the mixed rock.
Formation & geological history
Formed when clay-rich sedimentary rock was buried, heated, and compressed, aligning mica into foliation; age cannot be determined from the image and varies by region.
Uses & applications
Used as a decorative stone, landscaping material, and occasionally building stone; mica-bearing specimens are commonly collected rather than used as ore.
Geological facts
Schistosity is the coarse, visible alignment of platy minerals produced by metamorphism.
Field identification & locations
Look for sparkly mica flakes and a layered, readily splitting texture; commonly found in regional metamorphic belts. The image supports a mica-rich foliated rock, but does not establish its exact mineral proportions.
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