metamorphic
Schist
Mica Schist
Hardness: 3.5-4 on Mohs scale; Color: Grayish-green to silver; Luster: Pearly to sub-metallic; Crystal structure: Foliated/Platy; Cleavage: Perfect basal cleavage in mica minerals; Specific gravity: 2.7-2.8
- Hardness
- 3
- Color
- Grayish-green to silver
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: Grayish-green to silver; Luster: Pearly to sub-metallic; Crystal structure: Foliated/Platy; Cleavage: Perfect basal cleavage in mica minerals; Specific gravity: 2.7-2.8
Formation & geological history
Formed through regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures, typically during mountain-building events.
Uses & applications
Primarily used as decorative stone in gardens, for floor tiles, or as a building material; occasionally used for small carvings.
Geological facts
Schist is characterized by its high mica content, which gives it a distinct 'shimmering' appearance when light hits the flat mineral faces.
Field identification & locations
Identified in the field by its distinct platy foliation (schistosity) and shimmering mica minerals like muscovite or biotite. It is commonly found in metamorphic terranes like the Appalachian Mountains.
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