metamorphic
Mica Schist
Mica Schist (contains Muscovite, Biotite, and Quartz)
Hardness: 3.5-4 on Mohs scale; Color: Silvery-gray, gold, or brown with a sparkly appearance; Luster: Pearly to metallic; Structure: Foliated with distinct planar orientation; Cleavage: High fissility into thin sheets.
- Hardness
- 3
- Color
- Silvery-gray, gold, or brown with a sparkly appearance
- Luster
- Pearly to metallic
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: Silvery-gray, gold, or brown with a sparkly appearance; Luster: Pearly to metallic; Structure: Foliated with distinct planar orientation; Cleavage: High fissility into thin sheets.
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature conditions. Typically associated with mountain-building events (orogenies).
Uses & applications
Used occasionally in construction as a fill material, for decorative garden stones, or ground up for use in paints and lubricants due to the mica content.
Geological facts
The term 'schist' comes from the Greek word 'schistos,' meaning 'easy to split.' It is characterized by the presence of large mineral grains that align to give it a shimmering, glittery effect.
Field identification & locations
Identified in the field by its intense 'schistosity' or layered appearance that glitters in the sun. It breaks easily along parallel planes and is commonly found in core zones of mountain ranges like the Appalachians or Alps.
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