metamorphic
Mica Schist
Mica Schist
Hardness: 3.5-4 (Mohs scale); Color: Silver, grey, or greenish-grey; Luster: Pearly to sub-metallic; Crystal structure: Foliated; Cleavage: Perfect basal cleavage in individual mica grains; Specific gravity: 2.7-3.0
- Hardness
- 3
- Color
- Silver, grey, or greenish-grey
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4 (Mohs scale); Color: Silver, grey, or greenish-grey; Luster: Pearly to sub-metallic; Crystal structure: Foliated; Cleavage: Perfect basal cleavage in individual mica grains; Specific gravity: 2.7-3.0
Formation & geological history
Formed through the regional metamorphism of shale or mudstone at medium-grade temperatures and pressures. This specimen displays prominent foliation from the alignment of platy mica minerals.
Uses & applications
Used primarily for decorative purposes, landscape stone, and occasionally as a source for ground mica in industrial applications like fillers or roof shingles.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', which means 'to split', referring to the rock's tendency to split easily along its foliation planes.
Field identification & locations
Look for a shiny, 'glittery' appearance due to the high mica content and a distinct layered or wavy foliated texture. Common in ancient mountain belts.
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