metamorphic
Green Schist
Greenschist (containing Chlorite, Actinolite, and Epidote)
Hardness: 3.5-4.5 (variable); Color: Pale green to dark green; Luster: Pearly to sub-vitreous; Structure: Foliated with distinct platy or elongated mineral alignment; Cleavage: Good in one direction due to mica/chlorite content.
- Hardness
- 3
- Color
- Pale green to dark green
- Luster
- Pearly to sub-vitreous
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Physical properties
Hardness: 3.5-4.5 (variable); Color: Pale green to dark green; Luster: Pearly to sub-vitreous; Structure: Foliated with distinct platy or elongated mineral alignment; Cleavage: Good in one direction due to mica/chlorite content.
Formation & geological history
Formed via regional metamorphism of mafic igneous rocks (like basalt) under relatively low temperature (300-450 C) and moderate pressure conditions, typically during mountain-building events.
Uses & applications
Used primarily as crushed stone for construction, decorative garden stone, and occasionally for minor architectural carvings or as building facades.
Geological facts
Greenschist is a major component of the 'Greenschist Facies,' a diagnostic metamorphic grade that helps geologists understand the pressure and temperature history of a mountain range.
Field identification & locations
Identify by its characteristic green color and distinct layer-like alignment of minerals (foliation). It often feels slightly greasy or soapy if chlorite-rich. Found in orogenic belts such as the Appalachians or the Alps.
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