metamorphic
Weathered mica-rich metamorphic rock
Probable mica schist or micaceous quartzite; exact identification requires testing
AI-generated identification · may be incorrectGray-brown, strongly weathered, with sparkly platy mica and granular quartz; likely Mohs 2–3 on mica-rich surfaces and 6–7 where quartz dominates. Uneven texture, no obvious cleavage at specimen scale, and a dull to pearly luster.
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Physical properties
Gray-brown, strongly weathered, with sparkly platy mica and granular quartz; likely Mohs 2–3 on mica-rich surfaces and 6–7 where quartz dominates. Uneven texture, no obvious cleavage at specimen scale, and a dull to pearly luster.
Formation & geological history
Likely formed when shale or quartz-rich sediment was buried, heated, and compressed during regional metamorphism, commonly hundreds of millions to billions of years ago. Surface pitting and browning reflect later chemical weathering.
Uses & applications
Used locally as decorative stone, landscaping material, or aggregate; attractive pieces may be collected, but this specimen is unlikely to have jewelry value.
Geological facts
Mica flakes produce the glittering appearance and can separate into thin elastic sheets. Weathered mica-rich rocks are commonly mistaken for metallic ores because of their sparkle.
Field identification & locations
Look for visible mica flakes, quartz grains, foliation, and a glass-scratching-hard quartz fraction; a streak, hardness, and acid test would refine identification. Common in ancient metamorphic terrains worldwide.
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