metamorphic
Biotite Schist
Metamorphic rock primarily composed of biotite mica and quartz
AI-generated identification · may be incorrectMohs hardness 2.5-3 for mica; color ranges from dark brown to black with a shiny, pearly to metallic luster; exhibits pronounced foliation and flaky cleavage.
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Physical properties
Mohs hardness 2.5-3 for mica; color ranges from dark brown to black with a shiny, pearly to metallic luster; exhibits pronounced foliation and flaky cleavage.
Formation & geological history
Formed through regional metamorphism of argillaceous sedimentary rocks like shale or mudstone under high temperature and pressure.
Uses & applications
Primarily used as an educational sample and collected by mineral enthusiasts; not commonly utilized in heavy construction due to high cleavage.
Geological facts
The distinct sparkling appearance is due to the reflection of light off abundant microscopic biotite crystal flakes aligned parallel to each other.
Field identification & locations
Identify in the field by its distinct foliation, sparkly mica flakes, and dark color. Commonly found in regional metamorphic terranes worldwide.
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