metamorphic
Mica Schist
Schist (Muscovite-Biotite Schist)
AI-generated identification · may be incorrectHardness: 3.5–4 on Mohs scale; Color: Silvery-gray, brownish-gray; Luster: Pearly to sub-metallic due to mica flakes; Structure: Foliated with visible platy minerals and a schistose texture; Cleavage: Excellent basal cleavage in individual mica grains; Specific Gravity: 2.7–2.8.
- Hardness
- 3
- Color
- Silvery-gray, brownish-gray
- Luster
- Pearly to sub-metallic due to mica flakes
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Physical properties
Hardness: 3.5–4 on Mohs scale; Color: Silvery-gray, brownish-gray; Luster: Pearly to sub-metallic due to mica flakes; Structure: Foliated with visible platy minerals and a schistose texture; Cleavage: Excellent 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 common in the roots of mountain belts formed during Precambrian or Paleozoic tectonic events.
Uses & applications
Primarily used as a decorative stone in landscaping, flagstone for walkways, and as a source for ground mica used in roofing materials, paint, and cosmetics.
Geological facts
The word 'schist' is derived from the Greek word 'schizein' meaning 'to split,' referring to how easily the rock breaks along its layered mica plates. It often contains accessory minerals like red almandine garnets.
Field identification & locations
Identify by its 'glittery' appearance when held under sunlight and its layered, flaky texture. It is extremely common in the Appalachian Mountains, Scandinavia, and the Alps. Look for the distinct foliation that allows it to be split into thin slabs.
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