metamorphic
Greenschist
Chlorite schist
Hardness: 3.5-4.5 on Mohs scale; Color: Dull green to gray-green; Luster: Pearly to sub-vitreous; Crystal Structure: Foliated with fine-grained texture; Cleavage: Excellent in one direction (slaty/schistose); Specific Gravity: 2.8-3.0
- Hardness
- 3
- Color
- Dull green to gray-green
- Luster
- Pearly to sub-vitreous
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Physical properties
Hardness: 3.5-4.5 on Mohs scale; Color: Dull green to gray-green; Luster: Pearly to sub-vitreous; Crystal Structure: Foliated with fine-grained texture; Cleavage: Excellent in one direction (slaty/schistose); Specific Gravity: 2.8-3.0
Formation & geological history
Formed through the regional metamorphism of mafic volcanic rocks (like basalt) under low temperature and moderate pressure conditions, typically during mountain-building events.
Uses & applications
Used primarily as decorative stone in landscaping, crushed stone for construction, and occasionally for carving or historical architectural cladding.
Geological facts
The 'green' color is primarily due to the presence of chlorite, epidote, or actinolite minerals. It represents the low-grade facies of metamorphism.
Field identification & locations
Identify by its distinctive greenish hue and scaly or platy foliated texture. Common in Appalachian and Alpine mountain chains. Best found in areas with exposed oceanic crust or volcanic arcs.
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