metamorphic
Mica-rich schist
Mica schist, composed chiefly of muscovite and/or biotite mica with quartz and possibly feldspar
AI-generated identification · may be incorrectDark gray, coarse and visibly foliated, with reflective silvery mica flakes. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz, if present, is hardness 7. The image alone does not establish exact composition or specific gravity.
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Physical properties
Dark gray, coarse and visibly foliated, with reflective silvery mica flakes. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz, if present, is hardness 7. The image alone does not establish exact composition or specific gravity.
Formation & geological history
Formed when clay-rich sedimentary rock or other protolith was metamorphosed under heat and pressure, aligning mica into layers. Its age depends on the local geology and cannot be determined from the photograph.
Uses & applications
Used as a decorative or educational specimen; schist may also be used locally as building or landscaping stone, though its foliation can make it split unevenly.
Geological facts
Its glitter comes from numerous mica sheets reflecting light; foliation and mineral proportions vary widely among schists.
Field identification & locations
Look for a strongly layered texture and platy, sparkly minerals that may peel or split along foliation. Schist occurs in metamorphic belts worldwide; this hand-sized specimen’s locality is unknown.
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