metamorphic
Mica-rich schist (probable)
Foliated quartz–mica schist; likely containing quartz, muscovite and/or biotite
AI-generated identification · may be incorrectCoarse, sparkly, gray-gold surface with visible flaky grains and weak foliation. Quartz is Mohs 7; mica is about 2–3; exact hardness, luster, and composition cannot be confirmed from the photo.
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Physical properties
Coarse, sparkly, gray-gold surface with visible flaky grains and weak foliation. Quartz is Mohs 7; mica is about 2–3; exact hardness, luster, and composition cannot be confirmed from the photo.
Formation & geological history
Formed when clay-rich sedimentary or igneous rocks underwent regional metamorphism, aligning mica into a foliated texture. Its age is indeterminate from appearance alone.
Uses & applications
Schist is used as decorative or landscaping stone and occasionally as building stone; attractive specimens are collected.
Geological facts
The reflective, platy grains suggest mica, while the granular, lighter grains are consistent with quartz.
Field identification & locations
Look for sparkly mica flakes and a tendency to split along aligned layers; confirmatory identification requires examining the specimen directly. Schists occur in metamorphic mountain belts worldwide.
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