metamorphic
Greenschist
Chlorite schist
Hardness: 2-3 (Mohs scale); Color: green to dark green; Luster: vitreous to pearly; Crystal structure: monoclinic; Cleavage: perfect in one direction; Specific gravity: 2.6-3.0.
- Hardness
- 2-3 (Mohs scale)
- Color
- green to dark green
- Luster
- vitreous to pearly
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Physical properties
Hardness: 2-3 (Mohs scale); Color: green to dark green; Luster: vitreous to pearly; Crystal structure: monoclinic; Cleavage: perfect in one direction; Specific gravity: 2.6-3.0.
Formation & geological history
Formed through low-grade metamorphism of mafic igneous rocks like basalt or gabbro under relatively low temperature and pressure conditions (greenschist facies).
Uses & applications
Used primarily as decorative stone, in garden landscaping, and occasionally as a minor source of industrial minerals.
Geological facts
The characteristic green color is due to the presence of minerals like chlorite, epidote, and actinolite. It marks a specific zone of metamorphic intensity known as the greenschist facies.
Field identification & locations
Identify in the field by its distinct green color, foliated (layered) texture, and soft, flaky feel when scratched. Common in mountain belts like the Appalachians or the Alps.
