metamorphic
Schist
Mica Schist
Hardness: 3.5–4 on Mohs scale; Color: Gray, silvery-green, or brownish; Luster: Pearly to sub-metallic due to mica; Crystal structure: Foliated/Schistose texture; Cleavage: High basal cleavage in individual mica grains; Specific gravity: 2.7–2.8
- Hardness
- 3
- Color
- Gray, silvery-green, or brownish
- Luster
- Pearly to sub-metallic due to mica
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Physical properties
Hardness: 3.5–4 on Mohs scale; Color: Gray, silvery-green, or brownish; Luster: Pearly to sub-metallic due to mica; Crystal structure: Foliated/Schistose texture; Cleavage: High basal cleavage in individual mica grains; 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 Proterozoic or Paleozoic eras during mountain-building events (orogenies).
Uses & applications
Used as a decorative stone in gardens, for flagstones, and historically as a construction material for foundations or walls. Occasionally used in interior design as veneer.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to how the rock easily flakes into thin plates along its foliated planes.
Field identification & locations
Identify by its 'schistosity'—a distinct layering where visible mica flakes align. It will often sparkle or glitter when rotated under a light source. Commonly found in metamorphic belts like the Appalachians or the Alps.
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