metamorphic
Greenschist
Greenschist (Chlorite-actinolite schist)
Hardness: 3.5-4.5 on Mohs scale; Color: Green to grayish-green with white quartz veins; Luster: Pearly to dull; Crystal structure: Foliated (schistose); Cleavage: Distinct in one direction due to mica/chlorite content.
- Hardness
- 3
- Color
- Green to grayish-green with white quartz veins
- Luster
- Pearly to dull
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Physical properties
Hardness: 3.5-4.5 on Mohs scale; Color: Green to grayish-green with white quartz veins; Luster: Pearly to dull; Crystal structure: Foliated (schistose); Cleavage: Distinct in one direction due to mica/chlorite content.
Formation & geological history
Formed by the low-grade regional metamorphism of mafic igneous rocks (like basalt) at temperatures of 300 to 450 degrees Celsius and depths of 2 to 10 kilometers.
Uses & applications
Occasionally used as decorative stone, for garden walls, or as a source of industrial minerals; primarily of geological interest for mapping metamorphic zones.
Geological facts
The green color is primarily due to the presence of chlorite, epidote, and actinolite minerals. It defines the 'greenschist facies' in metamorphic geology.
Field identification & locations
Identify by its characteristic green hue and foliated, somewhat platy texture. Often found in mountain belts and subduction zones. Can be scratched with a steel knife.
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