metamorphic
Likely biotite-bearing schist
Mica schist, probably biotite-rich; exact identification is uncertain from the photo
AI-generated identification · may be incorrectDark gray, rough, and visibly sparkly, consistent with mica flakes. Schist commonly has Mohs hardness around 2–4 overall, variable cleavage, and a foliated texture; crystal structure depends on its minerals.
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Physical properties
Dark gray, rough, and visibly sparkly, consistent with mica flakes. Schist commonly has Mohs hardness around 2–4 overall, variable cleavage, and a foliated texture; crystal structure depends on its minerals.
Formation & geological history
Formed when clay-rich sedimentary or igneous rock was recrystallized under heat and pressure, aligning mica into foliation. Its age cannot be determined from the image.
Uses & applications
Schist is used locally as decorative or building stone; this small fragment is mainly suitable for a teaching or collection specimen.
Geological facts
The glitter likely comes from light reflecting off mica grains, a hallmark of many schists.
Field identification & locations
Look for platy, reflective mineral grains and a layered or foliated texture; distinguish it from massive, nonfoliated rocks. Schists occur in metamorphic belts worldwide.
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