metamorphic
Mica-rich metamorphic rock, likely schist
Muscovite- or biotite-bearing schist; composition commonly quartz + mica ± feldspar
AI-generated identification · may be incorrectSilvery to brown-gray, strongly foliated, flaky reflective luster, and uneven texture; individual mica flakes are Mohs 2–3, while quartz is Mohs 7. Exact identification requires testing cleavage, streak, hardness, and mineral grains.
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Physical properties
Silvery to brown-gray, strongly foliated, flaky reflective luster, and uneven texture; individual mica flakes are Mohs 2–3, while quartz is Mohs 7. Exact identification requires testing cleavage, streak, hardness, and mineral grains.
Formation & geological history
Formed when clay-rich sedimentary protoliths were regionally metamorphosed under directed pressure and moderate heat, commonly during mountain building; age cannot be determined from the photograph and may range from Precambrian to younger.
Uses & applications
Used locally as decorative stone, landscaping material, and occasionally aggregate; attractive mica-rich pieces are mainly collector specimens rather than jewelry gemstones.
Geological facts
The layered appearance results from mica alignment, producing schistosity; abundant shiny flakes distinguish schist from many massive rocks.
Field identification & locations
Look for thin sheets that split easily, glittering mica, and foliation that bends or wraps around lumps; common in metamorphic belts worldwide, including the Appalachians, Alps, Himalayas, and parts of India and Brazil.
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