metamorphic
Green Schist
Greenschist
Hardness: 3.5-4 (Mohs); Color: Pale green to dark green; Luster: Dull to pearly; Structure: Foliated or schistose; Cleavage: Good, splitting into thin sheets; Specific Gravity: 2.8-3.0.
- Hardness
- 3
- Color
- Pale green to dark green
- Luster
- Dull to pearly
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Physical properties
Hardness: 3.5-4 (Mohs); Color: Pale green to dark green; Luster: Dull to pearly; Structure: Foliated or schistose; Cleavage: Good, splitting into thin sheets; Specific Gravity: 2.8-3.0.
Formation & geological history
Formed through the regional metamorphism of mafic igneous rocks (like basalt) under low-temperature and high-pressure conditions (greenschist facies). Typical of subduction zones and mountain building events.
Uses & applications
Used primarily as decorative stone, crushed stone for construction, and occasionally for carving or architecture due to its attractive color.
Geological facts
The green color comes from minerals like chlorite, epidote, and actinolite. It represents a specific range of metamorphic conditions known to geologists as the 'greenschist facies'.
Field identification & locations
Identify by its distinct green hue and tendency to split along thin, parallel planes (foliation). Commonly found in ancient mountain belts like the Appalachians or the Alps. Look for the platy chlorite minerals.
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