metamorphic
Weathered mica-rich metamorphic rock
Probable biotite schist or mica schist
AI-generated identification · may be incorrectLayered, flaky texture with abundant dark biotite mica, pale quartz/feldspar, and rusty iron-oxide staining; mica has Mohs hardness 2–3, quartz about 7. Pearly to vitreous luster and pronounced foliation are typical.
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Physical properties
Layered, flaky texture with abundant dark biotite mica, pale quartz/feldspar, and rusty iron-oxide staining; mica has Mohs hardness 2–3, quartz about 7. Pearly to vitreous luster and pronounced foliation are typical.
Formation & geological history
Formed when clay-rich sedimentary rock was subjected to elevated temperature and pressure, aligning mica into foliation; commonly Precambrian to Paleozoic, though age depends on locality.
Uses & applications
Used locally as decorative stone, landscaping material, or aggregate, but its friability limits construction applications; generally low jewelry value.
Geological facts
The prominent flakes can separate along foliation, and the rusty colors result from oxidation of iron-bearing minerals. The image may also show weathering or heat alteration, so exact identification requires a fresh surface and tests.
Field identification & locations
Look for glittering aligned mica sheets, easy splitting, and a streakless/nonmetallic appearance; distinguish it from granite by its strong planar fabric. Common in regional metamorphic belts worldwide.
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