metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Silvery grey, green, or black; Luster: Pearly to sub-metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (due to mica); Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Silvery grey, green, or black
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Silvery grey, green, or black; Luster: Pearly to sub-metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (due to mica); Specific Gravity: 2.7-2.8
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures. Most specimens date from the Precambrian to Cenozoic eras.
Uses & applications
Historically used for flagstone, building facades, and occasionally as a source for industrial mica or ornamental garden stones.
Geological facts
The word schist comes from the Greek word 'schistos', meaning 'split', referring to the way the rock easily divides into thin plates along its foliated layers.
Field identification & locations
Identified in the field by its 'schistosity' or flaky, layered appearance and sparkling reflection due to mica flakes. Common in mountain ranges like the Alps or Appalachians.
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