metamorphic
Greenschist
Greenschist (Chlorite Schist)
Hardness: 3.5-4.5 on Mohs scale; Color: typically green, grayish-green, or olive; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Excellent in one direction (slaty/schistose); Specific Gravity: 2.8-3.0.
- Hardness
- 3
- Color
- typically green, grayish-green, or olive
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4.5 on Mohs scale; Color: typically green, grayish-green, or olive; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Excellent in one direction (slaty/schistose); Specific Gravity: 2.8-3.0.
Formation & geological history
Formed through regional metamorphism of mafic igneous rocks (like basalt) or dull sediments under low-temperature and moderate-pressure conditions (greenschist facies). This often occurs at convergent plate boundaries.
Uses & applications
Used primarily as decorative stone, in landscaping, minor construction aggregate, and occasionally in jewelry as low-grade green stone or for carving.
Geological facts
The green color is primarily due to the presence of minerals such as chlorite, epidote, and actinolite. It represents a specific range of metamorphic grade known as the 'Greenschist Facies'.
Field identification & locations
Identify by its distinctive green hue and foliated (layered) texture that allows it to split into thin sheets. It is commonly found in mountain belts and areas of ancient oceanic crust subduction. Look for it in riverbeds flowing from metamorphic terrains.
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