metamorphic
Tumbled mica-rich stone, likely muscovite schist
Muscovite-bearing quartz schist; chiefly muscovite mica, quartz, and possibly feldspar
AI-generated identification · may be incorrectGold-brown, platy and strongly reflective with visible parallel cleavage; mica has Mohs hardness 2–2.5, while quartz inclusions are 7. Luster is vitreous to pearly, with micaceous foliation and low-to-moderate specific gravity (about 2.7–2.9).
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Physical properties
Gold-brown, platy and strongly reflective with visible parallel cleavage; mica has Mohs hardness 2–2.5, while quartz inclusions are 7. Luster is vitreous to pearly, with micaceous foliation and low-to-moderate specific gravity (about 2.7–2.9).
Formation & geological history
Formed when clay-rich sedimentary rock underwent regional metamorphism, recrystallizing into aligned mica and quartz. Such rocks commonly formed during ancient mountain-building events, often Paleozoic or Precambrian in age.
Uses & applications
Primarily a collector specimen or ornamental tumbled stone; muscovite is used industrially for electrical insulation, fillers, and heat-resistant products. Schist itself may be used locally as decorative stone but is generally unsuitable for major construction due to foliation.
Geological facts
The glitter comes from mica cleavage surfaces, which can separate into extremely thin elastic sheets. Golden color may reflect iron-bearing mica or weathering; exact identification requires a close mineralogical examination.
Field identification & locations
Look for flexible, sheet-like flakes, strong sparkle, and foliation that splits along planes—features unlike glass or quartz alone. Common in metamorphic belts worldwide, including India, Brazil, the United States, and Europe.
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