metamorphic
Greenschist
Greenschist
Hardness: 3.5-4.5; Color: dull green to bright emerald green; Luster: vitreous to pearly; Crystal structure: foliated/schistose; Cleavage: perfect in one direction due to mica content; Specific gravity: 2.8-3.0.
- Hardness
- 3
- Color
- dull green to bright emerald green
- Luster
- vitreous to pearly
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Physical properties
Hardness: 3.5-4.5; Color: dull green to bright emerald green; Luster: vitreous to pearly; Crystal structure: foliated/schistose; Cleavage: perfect in one direction due to mica content; Specific gravity: 2.8-3.0.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks (like basalt) at low temperatures and high pressures, typically in subduction zones or mountain-building environments.
Uses & applications
Used primarily in landscaping, decorative stone for gardens, building facades, and occasionally as slabs for walkways. Not used in high-stress construction due to slaty cleavage.
Geological facts
The green color is primarily due to the presence of minerals like chlorite, epidote, and actinolite. The metamorphic facies associated with these rocks is known as the 'Greenschist Facies'.
Field identification & locations
Identify by its characteristic green hue and fine-grained, foliated (layered) texture that allows it to split into thin sheets. Common in mountain ranges like the Alps or the Appalachians.
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