metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Silvery-gray, greenish, or black; Luster: Pearly to sub-metallic; Structure: Foliated with visible mineral grains (schistosity); Cleavage: Perfect in one direction due to mica content.
- Hardness
- 3
- Color
- Silvery-gray, greenish, or black
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Silvery-gray, greenish, or black; Luster: Pearly to sub-metallic; Structure: Foliated with visible mineral grains (schistosity); Cleavage: Perfect in one direction due to mica content.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature conditions. Typically found in the roots of mountain belts.
Uses & applications
Used as a decorative stone in garden walls and landscaping; historically used for flagstones and roofing tiles; occasionally used in the production of filler materials.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the rock's ease of splitting along the plane of its platy minerals.
Field identification & locations
Identify in the field by its distinct glittering or sparkly appearance caused by mica flakes appearing in parallel layers. Commonly found in metamorphic terrains such as the Appalachian or Himalayan mountains.
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