metamorphic
Likely mica-rich schist
Mica schist, probably muscovite- and/or biotite-bearing; exact identification requires closer examination
AI-generated identification · may be incorrectGray, coarse and sparkly with a foliated, flaky texture. Mica has Mohs hardness about 2–3 and vitreous to pearly luster; the rock’s hardness and density depend on its other minerals.
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Physical properties
Gray, coarse and sparkly with a foliated, flaky texture. Mica has Mohs hardness about 2–3 and vitreous to pearly luster; the rock’s hardness and density depend on its other minerals.
Formation & geological history
Formed when clay-rich sedimentary rock was altered by heat and pressure, aligning mica into visible foliation. Metamorphic age cannot be determined from the photograph.
Uses & applications
Schist is used as decorative facing stone, landscaping stone, and aggregate; attractive specimens may be collected, though this sample appears ordinary.
Geological facts
The glitter is likely from reflected light off numerous mica flakes, not metallic minerals.
Field identification & locations
Look for platy minerals and layers or foliation; a fresh surface may split along mica-rich planes. Mica schists occur in metamorphic belts worldwide.
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