metamorphic
Biotite Schist
Metamorphic rock rich in biotite mica
AI-generated identification · may be incorrectMohs hardness 2.5-3 for mica flakes; brown to black color; pearly to submetallic luster; monoclinic crystal system with prominent planar foliation and perfect basal cleavage.
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Physical properties
Mohs hardness 2.5-3 for mica flakes; brown to black color; pearly to submetallic luster; monoclinic crystal system with prominent planar foliation and perfect basal cleavage.
Formation & geological history
Formed through regional metamorphism of argillaceous sedimentary rocks like shale or mudstone under high temperature and pressure.
Uses & applications
Used primarily in introductory geology education, ornamental landscaping, and occasionally as a crushed stone aggregate.
Geological facts
Biotite was named in honor of the French physicist Jean-Baptiste Biot. Its distinct platy structure causes the rock to easily flake into thin sheets.
Field identification & locations
Identify by its abundant shiny, dark mica flakes and strong foliation. Commonly found in ancient shields and mountain-building belts worldwide.
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