metamorphic
Biotite Schist
Metamorphic rock rich in biotite mica
AI-generated identification · may be incorrectHardness of 2 to 3 for the mica flakes, dark black to gray color with high metallic luster on cleavage planes, well-developed foliation.
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Physical properties
Hardness of 2 to 3 for the mica flakes, dark black to gray color with high metallic luster on cleavage planes, well-developed foliation.
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 and as a decorative stone in landscaping.
Geological facts
The abundant reflective flakes are biotite mica, which gives the rock its characteristic sparkly appearance.
Field identification & locations
Identified by its pronounced foliated texture (schistosity) and abundant shiny mica flakes; commonly found in mountain-building belts worldwide.
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