metamorphic
Schist
Chlorite-Mica Schist
Hardness: 3.5-5; Color: Greenish-gray with silver sheen; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Cleavage: Excellent in one direction due to mica content
- Hardness
- 3
- Color
- Greenish-gray with silver sheen
- Luster
- Pearly to sub-metallic
Identified More metamorphic →
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Physical properties
Hardness: 3.5-5; Color: Greenish-gray with silver sheen; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Cleavage: Excellent in one direction due to mica content
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate temperature and pressure conditions, typically during mountain-building events.
Uses & applications
Used historically as a building stone, for decorative garden walls, and occasionally for flagstones. Fine specimens are used in educational geology collections.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the ease with which the rock can be cleaved into thin plates.
Field identification & locations
Identify by its platy, layered appearance and the distinct 'glitter' or sheen when rotated in light. It is commonly found in metamorphic crystalline shields and mountain ranges like the Appalachians or the Alps.
