metamorphic
Schist
Mica Schist (Complex Silicates)
Mohs hardness: 3.5-4; Color: Silver, grey, or greenish with glittery sheen; Luster: Pearly to sub-metallic; Crystal structure: Foliated/Schistose; Cleavage: Perfect in one direction (micaceous); Specific gravity: 2.7-2.8
- Hardness
- 3
- Color
- Silver, grey, or greenish with glittery sheen
- Luster
- Pearly to sub-metallic
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Physical properties
Mohs hardness: 3.5-4; Color: Silver, grey, or greenish with glittery sheen; Luster: Pearly to sub-metallic; Crystal structure: Foliated/Schistose; Cleavage: Perfect in one direction (micaceous); Specific gravity: 2.7-2.8
Formation & geological history
Formed under intermediate-grade regional metamorphism of shale or mudstone. It represents a higher grade of metamorphism than slate and phyllite, where clay minerals transform into large micas.
Uses & applications
Primarily used as a decorative stone in landscape design, flagstone for walkways, and occasionally as a source of industrial mica or garnet if specific inclusions are present.
Geological facts
The glittering appearance is caused by the alignment of mica crystals like muscovite or biotite. It is one of the most common rocks that records the history of tectonic plate collisions.
Field identification & locations
Identify by its characteristic 'schistosity'—visible parallel alignment of mineral grains that sparkle in the sun. It will often easily peel or flake off in thin layers if poked with a hard tool.
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