metamorphic
Schist
Mica Schist
Hardness: 3.5-4 (Mohs); Color: Silver, gray, or greenish-brown; Luster: Pearly to sub-metallic; Crystal structure: Foliated (schistose); Cleavage: Perfect in one direction (micaceous); Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Silver, gray, or greenish-brown
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4 (Mohs); Color: Silver, gray, or greenish-brown; Luster: Pearly to sub-metallic; Crystal structure: Foliated (schistose); Cleavage: Perfect in one direction (micaceous); Specific Gravity: 2.7-2.8
Formation & geological history
Formed from the high-grade metamorphism of clay-rich sedimentary rocks (like shale) or fine-grained igneous rocks under high pressure and temperature conditions deep within the Earth's crust.
Uses & applications
Used as a decorative stone in architecture, garden walls, and occasionally for roofing or flagstone. Historically used for sharpening tools if fine-grained.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to its characteristic of splitting easily into thin internal layers.
Field identification & locations
Identify by its 'schistosity'—a strong alignment of visible mineral grains (usually mica) that creates a glittery, platy appearance. It is commonly found in mountain belts and metamorphic terrains.
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