metamorphic
Green Schist
Greenschist (containing Chlorite, Actinolite, and Epidote)
Hardness: 3.5-4.5 (Mohs scale); Color: Pale green to dark forest green with silvery sheen; Luster: Vitreous to pearly; Structure: Foliated with visible layering (schistosity); Specific gravity: 2.8-3.0
- Hardness
- 3
- Color
- Pale green to dark forest green with silvery sheen
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3.5-4.5 (Mohs scale); Color: Pale green to dark forest green with silvery sheen; Luster: Vitreous to pearly; Structure: Foliated with visible layering (schistosity); Specific gravity: 2.8-3.0
Formation & geological history
Formed through regional metamorphism of mafic igneous rocks (like basalt) under low-temperature and high-pressure conditions, typically occurring in subduction zones and mountain-building regions.
Uses & applications
Primarily used as decorative stone, for landscaping, and occasionally as a source for extracting certain minerals. Historically used for architectural carvings in some cultures.
Geological facts
Greenschist gets its name from the abundance of green minerals like chlorite and actinolite. It represents the 'Greenschist Facies,' a specific range of metamorphic conditions between 300°C and 450°C.
Field identification & locations
Identify by its characteristic green color and scaly or platy foliation that allows it to split into thin layers. Commonly found in metamorphic belts such as the Appalachian Mountains or the Alps.
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