metamorphic
Green Schist
Greenschist (composed of Chlorite, Actinolite, and Epidote)
Hardness: 3.5-4.5 (variable); Color: Dull green to bright emerald green; Luster: Pearly to sub-vitreous; Crystal structure: Monoclinic (foliated texture); Cleavage: Perfect in one direction due to mica-like minerals; Specific gravity: 2.8-3.0
- Hardness
- 3
- Color
- Dull green to bright emerald green
- Luster
- Pearly to sub-vitreous
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Physical properties
Hardness: 3.5-4.5 (variable); Color: Dull green to bright emerald green; Luster: Pearly to sub-vitreous; Crystal structure: Monoclinic (foliated texture); Cleavage: Perfect in one direction due to mica-like minerals; Specific gravity: 2.8-3.0
Formation & geological history
Formed through low-temperature, moderate-pressure regional metamorphism of mafic igneous rocks (like basalt). Common in orogenic belts where tectonic plates collide.
Uses & applications
Used primarily as decorative crushed stone, landscaping rock, and occasionally in construction as a low-grade flagstone or building facade. High-quality specimens are popular for amateur mineral collecting.
Geological facts
Greenschist facies is a major geological metamorphism classification. The green color is primarily derived from the presence of chlorite, which forms at depths of roughly 5 to 30 kilometers.
Field identification & locations
Identify in the field by its distinct green hue and 'schistose' foliation (layered appearance). It is commonly found in mountain ranges such as the Alps, the Appalachians, and the Scottish Highlands. Collectors look for pieces with visible actinolite needles.
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