metamorphic
Schist
Mica Schist (Metamorphic Rock)
Hardness: 3.5-4; Color: Bronze, brown, silver-grey; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Perfect basal cleavage in individual mica grains.
- Hardness
- 3
- Color
- Bronze, brown, silver-grey
- Luster
- Pearly to sub-metallic
Identified More metamorphic →
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Physical properties
Hardness: 3.5-4; Color: Bronze, brown, silver-grey; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Perfect basal cleavage in individual mica grains.
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under high pressure and temperature. This specimen shows significant iron oxide staining, giving it a weathered brown appearance.
Uses & applications
Used as decorative garden stones, in building facades, and sometimes as a minor source of industrial minerals. Highly valued by students for studying metamorphic textures.
Geological facts
The term schist is derived from the Greek word 'schistos' meaning 'can be split,' referring to the ease with which it can be cleaved along its mineral layers.
Field identification & locations
Identified by its 'schistosity' or layered, sparkly appearance due to alignment of mica flakes. Can be found in many mountain ranges like the Appalachians or Alps.
