metamorphic
Schist
Mica Schist (Metamorphic Rock)
Hardness: 3.5–5 Mohs; Color: Brown, gray, silver, gold with metallic sheen; Luster: Pearly to Vitreous/Metallic; Crystal structure: Foliated/Platy; Cleavage: Excellent in one direction (basal); Specific gravity: 2.7–2.8
- Hardness
- 3
- Color
- Brown, gray, silver, gold with metallic sheen
- Luster
- Pearly to Vitreous/Metallic
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Physical properties
Hardness: 3.5–5 Mohs; Color: Brown, gray, silver, gold with metallic sheen; Luster: Pearly to Vitreous/Metallic; Crystal structure: Foliated/Platy; Cleavage: Excellent in one direction (basal); Specific gravity: 2.7–2.8
Formation & geological history
Formed from the regional metamorphism of clay-rich sedimentary rocks (like shale or siltstone) under high temperature and pressure conditions, typically during mountain-building events.
Uses & applications
Used as decorative stone in landscape design, thin tiles for wall cladding, and occasionally in construction as a fill material.
Geological facts
The name 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the rock's ease of splitting along its foliated crystal layers.
Field identification & locations
Identified in the field by its distinct foliated texture (schistosity) and high mica content which creates a sparkling effect. Common in mountainous regions like the Alps, Appalachians, and Scottish Highlands.
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