metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Grey, silver, or black with metallic sheen; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Cleavage: Perfect mica-like cleavage on a microscopic to macroscopic level; Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Grey, silver, or black with metallic sheen
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Grey, silver, or black with metallic sheen; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Cleavage: Perfect mica-like cleavage on a microscopic to macroscopic level; 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. It is typically found in convergent plate boundaries and mountain belts like the Appalachians or Himalayas.
Uses & applications
Used as a decorative building stone, in paving, and for flagstones. Historically used for low-grade slate-like roofing in some regions.
Geological facts
The word 'schist' comes from the Greek word 'schizein', meaning 'to split,' referring to how easily the rock can be divided into thin plates along its foliated mineral layers.
Field identification & locations
Identify in the field by its distinct 'shimmer' or 'glitter' when rotated in sunlight and its tendency to flake into thin, flat pieces. Commonly found in most continental mountain ranges.
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