metamorphic
Greenschist
Chlorite schist
Hardness: 2-3 (Mohs scale), Color: Dull to bright green or grey-green, Luster: Silky to pearly on cleavage surfaces, Structure: Schistose (foliated), Cleavage: Perfect mica-like basal cleavage.
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Dull to bright green or grey-green, Luster: Silky to pearly on cleavage surfaces, Structure: Schistose (foliated), Cleavage: Perfect mica-like basal cleavage.
Formation & geological history
Formed through low-grade metamorphism of mafic igneous rocks (like basalt) or sedimentary rocks at temperatures of 300 to 450 degrees Celsius and modest pressures.
Uses & applications
Used primarily as decorative stone, crushed stone for construction, and sometimes for floor tiles or wall cladding.
Geological facts
The distinctive green color comes from minerals like chlorite, epidote, and actinolite. It represents a specific range of metamorphic conditions known as the 'Greenschist Facies'.
Field identification & locations
Identify by its characteristic green color and scaly, foliated texture. Common in ancient mountain belts and subduction zones where oceanic crust was metamorphosed.
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