metamorphic
Greenschist
Chlorite schist
Hardness: 3.5-4 (Mohs scale), Color: Green to greyish-green, Luster: Dull to pearly, Crystal structure: Foliated/Schistose, Cleavage: Excellent in one direction
- Hardness
- 3
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Physical properties
Hardness: 3.5-4 (Mohs scale), Color: Green to greyish-green, Luster: Dull to pearly, Crystal structure: Foliated/Schistose, Cleavage: Excellent in one direction
Formation & geological history
Formed through low-grade metamorphism of mafic igneous rocks (like basalt) under temperature of 300 to 450 degrees Celsius and low to moderate pressure.
Uses & applications
Mainly used for decorative landscaping and as an indicator for low-grade metamorphic facies in geological mapping.
Geological facts
The green color is primarily due to the presence of minerals like chlorite, epidote, and actinolite. It defines the 'Greenschist Facies' in metamorphic geology.
Field identification & locations
Identify by its distinct green hue and slaty or schistose layering. Commonly found in mountain belts where tectonic plates have collided.
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