metamorphic
Greenschist
Chlorite schist
Hardness: 2-3.5 (Mohs scale), Color: Greenish-grey to bright green, Luster: Silky to pearly on cleavage surfaces, Structure: Foliated with prominent schistosity, Clavage: Perfect basal cleavage due to mica content
- Hardness
- 2-3
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Physical properties
Hardness: 2-3.5 (Mohs scale), Color: Greenish-grey to bright green, Luster: Silky to pearly on cleavage surfaces, Structure: Foliated with prominent schistosity, Clavage: Perfect basal cleavage due to mica content
Formation & geological history
Formed by regional metamorphism of mafic igneous rocks (like basalt) under high pressure and low temperature conditions, typically within the greenschist facies at depths of 8-50 km.
Uses & applications
Used as decorative stone in gardens, for flagstones, roofing slates, and sometimes as a source for certain minerals like chlorite or actinolite.
Geological facts
Greenschist gets its color primarily from minerals like chlorite, epidote, and actinolite. It is a key indicator rock for geologists studying tectonic plate subduction zones.
Field identification & locations
Identified by its distinctive green color and plate-like or flaky structure (foliation). Look for it in mountain belts where ancient oceanic crust has been compressed.
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