metamorphic
Greenschist
Chlorite schist
Hardness: 3.5-4 (Mohs scale); Color: green to gray-green due to chlorite and epidote; Luster: dull to silky; Structure: foliated/schistose; Cleavage: perfect in one direction on mica flakes; Specific Gravity: 2.8–3.0
- Hardness
- 3
- Color
- green to gray-green due to chlorite and epidote
- Luster
- dull to silky
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Physical properties
Hardness: 3.5-4 (Mohs scale); Color: green to gray-green due to chlorite and epidote; Luster: dull to silky; Structure: foliated/schistose; Cleavage: perfect in one direction on mica flakes; Specific Gravity: 2.8–3.0
Formation & geological history
Formed through regional metamorphism of mafic igneous rocks (like basalt) under low-temperature and high-pressure conditions, typically in subduction zones or mountain-building environments.
Uses & applications
Used primarily as decorative stone, crushed stone for construction, and occasionally in landscaping.
Geological facts
Greenschist gets its color from 'green' minerals like chlorite, actinolite, and epidote. It represents a specific metamorphic facies that helps geologists understand the pressure and temperature history of an area.
Field identification & locations
Identify by its distinctive greenish hue and scaly or flaky foliation. Common in orogenic belts and coastal regions where ancient oceanic crust has been uplifted.
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