metamorphic
Greenschist
Greenschist facies rock (containing chlorite, actinolite, and epidote)
Hardness: 3.5-4.5 on Mohs scale; Color: Dull green to dark greyish-green; Luster: Dull to pearly; Crystal structure: Foliated or schistose texture; Specific gravity: 2.8-3.0.
- Hardness
- 3
- Color
- Dull green to dark greyish-green
- Luster
- Dull to pearly
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Physical properties
Hardness: 3.5-4.5 on Mohs scale; Color: Dull green to dark greyish-green; Luster: Dull to pearly; Crystal structure: Foliated or schistose texture; Specific gravity: 2.8-3.0.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks (like basalt) at temperatures of 300 to 450 degrees Celsius and moderate pressure.
Uses & applications
Used primarily as decorative stone, in landscaping, and sometimes as a minor source of architectural stone or roofing material in localized areas.
Geological facts
The green color comes from minerals like chlorite and epidote that form during metamorphism. It represents a specific 'facies' that helps geologists determine the pressure and temperature history of a mountain range.
Field identification & locations
Identify by its characteristic green hue and fine-grained, slightly layered (foliated) texture. Commonly found in orogenic belts such as the Appalachian Mountains or the Alps.
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