metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite)
Hardness: 2-3 (Mohs scale), Color: Silvery-gray to brownish-black, Luster: Pearly to sub-metallic/glittery, Crystal structure: Monoclinic, Cleavage: Perfect basal (peels into thin sheets), SG: 2.7-3.2
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Silvery-gray to brownish-black, Luster: Pearly to sub-metallic/glittery, Crystal structure: Monoclinic, Cleavage: Perfect basal (peels into thin sheets), SG: 2.7-3.2
Formation & geological history
Formed through regional metamorphism of shale or mudstone at intermediate temperatures and pressures. This process aligns micas to create a foliated texture known as schistosity.
Uses & applications
Used primarily as decorative stone, in garden landscaping, as a filler in paints or plastics when ground, and occasionally for historical building roofing.
Geological facts
The glittery appearance is due to the flat surfaces of mica reflecting light. It is one of the most common metamorphic rocks in mountain belts like the Appalachians or Himalayas.
Field identification & locations
Identify by its sparkly, layered appearance and tendency to flake off in small, thin plates. Commonly found in metamorphic terrains or along riverbeds in mountainous areas.
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