metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Grey with silver sheen; Luster: Pearly to sub-metallic; Crystal Structure: Foliated/Platy; Cleavage: High (fissile into thin layers); Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Grey with silver sheen
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Grey with silver sheen; Luster: Pearly to sub-metallic; Crystal Structure: Foliated/Platy; Cleavage: High (fissile into thin layers); Specific Gravity: 2.7-2.8
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under high temperature and pressure, typically during mountain-building events. Geological age varies by location.
Uses & applications
Used as a decorative stone in landscaping, flagstone for paving, architectural facing, and occasionally as a source for industrial minerals like graphite or garnet.
Geological facts
The shimmering appearance is caused by the alignment of mica crystals, which reflect light. It is a 'medium-grade' metamorphic rock, sitting between phyllite and gneiss in the metamorphic sequence.
Field identification & locations
Identify in the field by its distinct foliation (schistosity) and 'sparkly' surface. Frequently found in crystalline mountain ranges like the Appalachians or Alps.
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