metamorphic
Likely mica schist
Mica-rich schist, probably biotite–quartz–feldspar schist
AI-generated identification · may be incorrectDark gray-brown, visibly foliated and sparkly with pale mineral flecks; likely Mohs 2–7 depending on mineral tested. Mica has sheet-like cleavage; quartz and feldspar are harder, with no obvious cleavage in the specimen.
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Physical properties
Dark gray-brown, visibly foliated and sparkly with pale mineral flecks; likely Mohs 2–7 depending on mineral tested. Mica has sheet-like cleavage; quartz and feldspar are harder, with no obvious cleavage in the specimen.
Formation & geological history
Formed when clay-rich sedimentary or igneous rock was subjected to heat and pressure, aligning mica into foliation. Its age cannot be determined from the image and varies by geological terrane.
Uses & applications
Commonly used as decorative building or landscaping stone; attractive pieces may be kept as teaching or collection specimens.
Geological facts
The layered, glittering appearance is characteristic of schistosity, produced by aligned platy minerals such as mica.
Field identification & locations
Look for wavy layers and reflective mica flakes; distinguish it from slate by its coarser grains and stronger sparkle. Schist occurs in metamorphic mountain belts worldwide.
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