metamorphic
Weathered mica-rich metamorphic rock, likely schist
Mica schist (likely muscovite–quartz schist; exact identification requires closer examination)
AI-generated identification · may be incorrectGray-silver, sparkly surface with flaky mica and quartz-rich patches; schistose texture. Quartz has Mohs hardness 7 and mica about 2–3; the specimen’s hardness varies with its minerals.
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Physical properties
Gray-silver, sparkly surface with flaky mica and quartz-rich patches; schistose texture. Quartz has Mohs hardness 7 and mica about 2–3; the specimen’s hardness varies with its minerals.
Formation & geological history
Formed when clay-rich or sedimentary rock was buried and metamorphosed by heat and pressure, aligning mica into visible foliation. Its age cannot be determined from the image.
Uses & applications
Commonly used as decorative landscaping stone and sometimes as building or dimension stone; collectible value is usually modest.
Geological facts
The reflective sheen comes from mica flakes; the uneven, layered appearance is characteristic of foliation in schist.
Field identification & locations
Look for glittering platy minerals and a tendency to split along wavy layers; quartz-rich bands and weathering make the identification provisional. Schists occur in metamorphic mountain belts worldwide.
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