metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Grey, brown, or brownish-black with a silvery sheen; Luster: Sub-metallic to vitreous; Structure: Foliated with visible mineral grains; Cleavage: Perfect in one direction (slaty/schistose).
- Hardness
- 3
- Color
- Grey, brown, or brownish-black with a silvery sheen
- Luster
- Sub-metallic to vitreous
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Physical properties
Hardness: 3.5-4; Color: Grey, brown, or brownish-black with a silvery sheen; Luster: Sub-metallic to vitreous; Structure: Foliated with visible mineral grains; Cleavage: Perfect in one direction (slaty/schistose).
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature. Geological age varies greatly from Precambrian to Cenozoic depending on the mountain-building event.
Uses & applications
Used primarily in construction for decorative stone, paving, and walling. Historically used for roofing and writing slates in some regions.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to its ease of splitting along the planes of mica flakes.
Field identification & locations
Identify by its 'schistosity', which is a layering of platy minerals like micas that give the rock a distinctive sparkle or glittery appearance when moved in the light.
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