metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
Hardness: 2-4 (Mohs scale), Color: Silvery-gray to brownish with sparkling flakes, Luster: Pearly to sub-metallic, Crystal structure: Monoclinic (in individual mica sheets), Cleavage: Perfect basal cleavage on mica grains, Texture: Foliated with visible glittery grains.
Identified More metamorphic →
Explore Mica Schist in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 2-4 (Mohs scale), Color: Silvery-gray to brownish with sparkling flakes, Luster: Pearly to sub-metallic, Crystal structure: Monoclinic (in individual mica sheets), Cleavage: Perfect basal cleavage on mica grains, Texture: Foliated with visible glittery grains.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under medium-grade pressure and heat. It is characterized by the alignment of platy mica minerals during the deformation process.
Uses & applications
Primarily used as a decorative stone in landscaping, flagstone for paving, and sometimes crushed for road construction. High-grade mica is used in electronics for insulation.
Geological facts
The glittering effect on the surface is caused by 'schistosity,' the alignment of mica flakes which reflects light. Schist is the intermediate stage between phyllite and gneiss.
Field identification & locations
Identify by its characteristic 'sparkle' and flaky, layered appearance. It is common in mountain belts and metamorphic terrains. Collectors look for well-defined foliation or inclusions of garnet.
More like this
