metamorphic
Green Schist
Greenschist (Chlorite Schist)
Hardness: 3.5-4 (Mohs scale); Color: Dark green to grayish-green; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Excellent in one direction (slaty/schistose); Specific Gravity: 2.8-3.0
- Hardness
- 3
- Color
- Dark green to grayish-green
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4 (Mohs scale); Color: Dark green to grayish-green; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Excellent in one direction (slaty/schistose); Specific Gravity: 2.8-3.0
Formation & geological history
Formed through regional metamorphism of mafic igneous rocks (like basalt) or sedimentary rocks under low temperature and moderate pressure conditions (Greenschist Facies).
Uses & applications
Used primarily as decorative stone, for landscaping, and historically for floor tiles or roof shingles in local areas where it is abundant.
Geological facts
The green color is primarily due to the presence of minerals like chlorite, epidote, and actinolite. It is a key indicator rock for geologists to understand the metamorphic history of a mountain range.
Field identification & locations
Identify by its distinctive green hue and foliated (layered) texture that often allows it to be split into thin flakes. Commonly found in orogenic (mountain-building) belts like the Appalachians or the Alps.
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