metamorphic
Mica Schist
Mica Schist (Silicate rock)
Hardness: 3.5 to 5 on Mohs scale; Color: Silvery-gray to brownish with sparkling metallic luster; Structure: Foliated with prominent mica flakes; Cleavage: Perfect basal cleavage on individual mica crystals.
- Hardness
- 3
- Color
- Silvery-gray to brownish with sparkling metallic luster
Identified More metamorphic →
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Physical properties
Hardness: 3.5 to 5 on Mohs scale; Color: Silvery-gray to brownish with sparkling metallic luster; Structure: Foliated with prominent mica flakes; Cleavage: Perfect basal cleavage on individual mica crystals.
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks (shales or mudstones) under intermediate-grade temperature and pressure conditions, typically during mountain-building events.
Uses & applications
Used historically as a building stone, for decorative flagstones, and as a source of industrial mica for electronics and insulation. Collectors value high-sparkle specimens.
Geological facts
The sparkling 'glitter' effect is caused by the alignment of muscovite or biotite mica flakes. Schist is the intermediate stage between phyllite and gneiss in the metamorphic series.
Field identification & locations
Identified by its characteristic 'schistosity' or layered sparkling appearance. Commonly found in metamorphic terrains like the Appalachian Mountains or the Alps. Look for leaves of mica that can be peeled off with a knife.
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