metamorphic
Biotite Schist
Metamorphic Schist containing biotite mica
AI-generated identification · may be incorrectHardness 2-3 on Mohs scale, dark brown to black color with a shiny, pearly luster, well-developed foliation, and distinct flaky cleavage.
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Physical properties
Hardness 2-3 on Mohs scale, dark brown to black color with a shiny, pearly luster, well-developed foliation, and distinct flaky cleavage.
Formation & geological history
Formed through regional metamorphism of shale or pelitic igneous rocks under high temperatures and directed pressure.
Uses & applications
Primarily used as an educational geological specimen, occasionally in landscaping stone, and historically as a source of mica.
Geological facts
Biotite is named after the French physicist Jean-Baptiste Biot and is part of the phyllosilicate mineral group.
Field identification & locations
Identified by its characteristic flaky, glittering sheets of dark mica within a foliated matrix; found worldwide in metamorphic belts.
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