metamorphic
Green Schist
Greenschist (Chlorite Schist)
Mohs hardness: 2-3.5; Color: dull green to bright green; Luster: Pearly to dull; Crystal structure: Monoclinic (microscopic); Cleavage: Perfect basal (fissile foliation); Specific gravity: 2.7-3.0.
- Hardness
- 2-3
- Color
- dull green to bright green
- Luster
- Pearly to dull
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Physical properties
Mohs hardness: 2-3.5; Color: dull green to bright green; Luster: Pearly to dull; Crystal structure: Monoclinic (microscopic); Cleavage: Perfect basal (fissile foliation); Specific gravity: 2.7-3.0.
Formation & geological history
Formed by regional metamorphism of mafic igneous rocks (like basalt) under low temperature and moderate pressure conditions, typically during tectonic plate collisions.
Uses & applications
Used occasionally as decorative stone, in landscaping, and sometimes as a minor source of metals if containing mineral veins; primarily of interest to geological collectors.
Geological facts
Greenschist facies define a specific grade of metamorphism. The green color is primarily due to the presence of chlorite, epidote, or actinolite minerals.
Field identification & locations
Identified in the field by its distinct green hue and strongly foliated, plate-like alignment of minerals which allows it to split easily. Common in orogenic belts like the Appalachians or the Alps.
