metamorphic
Mica Schist
Schist (Muscovite/Biotite Schist)
Hardness: 3.5-4; Color: Silver, grey, or greenish-grey; Luster: Pearly to sub-metallic due to high mica content; Crystal Structure: Foliated; Cleavage: Perfect basal cleavage in mica components; Specific Gravity: 2.7-3.0
- Hardness
- 3
- Color
- Silver, grey, or greenish-grey
- Luster
- Pearly to sub-metallic due to high mica content
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3.5-4; Color: Silver, grey, or greenish-grey; Luster: Pearly to sub-metallic due to high mica content; Crystal Structure: Foliated; Cleavage: Perfect basal cleavage in mica components; Specific Gravity: 2.7-3.0
Formation & geological history
Formed from the regional metamorphism of clay-rich sedimentary rocks (shales) or igneous rocks at intermediate temperature and pressure depths. Usually associated with mountain-building events.
Uses & applications
Used historically as a building material for stone walls and flagstones; occasionally used for garden decoration or as a filler in cement/plaster. Industrial mica is used as an insulator in electronics.
Geological facts
The term 'Schist' is derived from the Greek word 'schizein' meaning 'to split', referring to the rock's tendency to flake off in layers. The glittering effect is caused by large, visible flakes of muscovite or biotite mica.
Field identification & locations
Identify in the field by its distinct glittering sheen under sunlight and its tendency to flake into thin, flat plates when struck. Found in metamorphic belts such as the Appalachian or Himalayan mountains.
More like this
