metamorphic
Schist
Schist (Crystalline metamorphic rock)
Hardness: 3.5-5; Color: Silvery grey to green; Luster: Pearly to sub-metallic; Crystal structure: Foliated; Cleavage: Excellent in one direction (slaty/schistose)
- Hardness
- 3
- Color
- Silvery grey to green
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-5; Color: Silvery grey to green; Luster: Pearly to sub-metallic; Crystal structure: Foliated; Cleavage: Excellent in one direction (slaty/schistose)
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures, causing the alignment of plate-like mica minerals.
Uses & applications
Used historically for roofing materials, flagstones, and garden decorations; occasionally used as a source of industrial garnet or mica.
Geological facts
The term schist is derived from the Greek word 'schistos', meaning 'split', referring to the ease with which the rock can be layered or split.
Field identification & locations
Identified by its shiny, platy mineral appearance and distinct foliation. Found in many mountainous regions such as the Alps and the Appalachians.
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