metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Gray, silver, or greenish-gray; Luster: Pearly to sub-metallic; Crystal Structure: Foliated with large, visible grains; Cleavage: Excellent in one direction (slaty/schistose); Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Gray, silver, or greenish-gray
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Gray, silver, or greenish-gray; Luster: Pearly to sub-metallic; Crystal Structure: Foliated with large, visible grains; Cleavage: Excellent in one direction (slaty/schistose); 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. Most common in mountain-building belts and crustal plate boundaries.
Uses & applications
Used as decorative stone in landscaping, flagstone for walkways, crushed stone for road construction, and occasionally for interior design finishes.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', which means 'to split,' referring to the rock's ability to split easily along the planes of mica flakes.
Field identification & locations
Identify by its 'schistosity'—a sparkly, foliated texture caused by aligned mica flakes. Commonly found in folded mountain ranges. Collectors look for accessory minerals like garnets often embedded within.
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