metamorphic
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
Hardness: 3.5-4.5; Color: Dull green to dark grey-green; Luster: Pearly to Vitreous; Crystal Structure: Foliated; Cleavage: Perfect schistosity; Specific Gravity: 2.8-3.0
- Hardness
- 3
- Color
- Dull green to dark grey-green
- Luster
- Pearly to Vitreous
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Physical properties
Hardness: 3.5-4.5; Color: Dull green to dark grey-green; Luster: Pearly to Vitreous; Crystal Structure: Foliated; Cleavage: Perfect schistosity; Specific Gravity: 2.8-3.0
Formation & geological history
Formed through regional metamorphism of mafic igneous rocks (like basalt) under low temperature and moderate pressure conditions, typically in subduction zones or orogenic belts.
Uses & applications
Primarily used as decorative stone, in landscaping, and historically for stone hearths or carvings due to moderate softness.
Geological facts
The green color is primarily due to the presence of chlorite and actinolite. It represents a specific 'metamorphic facies' indicating low-grade metamorphic conditions.
Field identification & locations
Look for a distinct greenish hue and visible foliation (layering). It is commonly found in mountain ranges and along riverbeds in metamorphic terrains like the Alps or the Appalachian Mountains.
