metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Silvery-gray, gold, or brown with iron staining; Luster: Pearly to sub-metallic (shimmery); Structure: Foliated with visible mineral grains; Cleavage: Excellent basal cleavage in mica components.
- Hardness
- 3
- Color
- Silvery-gray, gold, or brown with iron staining
- Luster
- Pearly to sub-metallic (shimmery)
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Physical properties
Hardness: 3.5-4; Color: Silvery-gray, gold, or brown with iron staining; Luster: Pearly to sub-metallic (shimmery); Structure: Foliated with visible mineral grains; Cleavage: Excellent basal cleavage in mica components.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under medium-grade temperature and pressure conditions, typically during mountain-building events (orogenies).
Uses & applications
Used as decorative stone in gardens, flagstone for walkways, and historically as a construction material for foundations or walls; some varieties contain industrial minerals like garnet.
Geological facts
The word 'schist' comes from the Greek word 'schistos,' meaning 'split,' referring to the rock's ability to be easily split into thin layers due to its foliation.
Field identification & locations
Identify by its 'schistosity'—the alignment of plate-like minerals (mica) that create a glittering, scaly appearance. Commonly found in metamorphic belts like the Appalachians or Alps.
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