metamorphic
Mica schist
Mica-rich schist, likely muscovite–quartz schist
AI-generated identification · may be incorrectFine- to medium-grained, strongly foliated and glittery, with tan-gold mica-rich layers and pale quartz/feldspar. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz is hardness 7. Exact mineral proportions cannot be confirmed from the image.
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Physical properties
Fine- to medium-grained, strongly foliated and glittery, with tan-gold mica-rich layers and pale quartz/feldspar. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz is hardness 7. Exact mineral proportions cannot be confirmed from the image.
Formation & geological history
Formed when clay-rich sediment or other rocks underwent regional metamorphism, aligning mica into visible foliation. Its age cannot be determined visually and depends on the source locality.
Uses & applications
Used locally as decorative or landscaping stone and collected as a specimen; mica and quartz have industrial uses, though this small piece is not an ore-grade material.
Geological facts
Schistosity is the characteristic wavy, layered fabric produced by aligned platy minerals under heat and pressure.
Field identification & locations
Identify by its sparkly, sheet-like mica and pronounced foliation; similar schists occur in metamorphic belts worldwide. A close look or simple mineral tests would be needed to distinguish mica species and confirm the rock name.
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