metamorphic
Greenschist
Greenschist (Actinolite-Chlorite Schist)
Hardness: 3.5-4.5 (Mohs scale); Color: Pale green to greyish-green; Luster: Pearly to sub-vitreous; Crystal Structure: Foliated or schistose texture; Cleavage: Good in one direction; Specific Gravity: 2.80 - 3.00
- Hardness
- 3
- Color
- Pale green to greyish-green
- Luster
- Pearly to sub-vitreous
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Physical properties
Hardness: 3.5-4.5 (Mohs scale); Color: Pale green to greyish-green; Luster: Pearly to sub-vitreous; Crystal Structure: Foliated or schistose texture; Cleavage: Good in one direction; Specific Gravity: 2.80 - 3.00
Formation & geological history
Formed through low-temperature, moderate-pressure regional metamorphism of mafic igneous rocks (like basalt). Usually occurs in orogenic belts ranging from Precambrian to more recent geological eras.
Uses & applications
Commonly used as crushed stone in construction, road base material, and occasionally as decorative stone or architectural cladding.
Geological facts
The green color is primarily due to the minerals chlorite, epidote, and actinolite. It represents a specific 'facies' in metamorphic geology indicating moderate burial depths.
Field identification & locations
Identify in the field by its distinct greenish hue and visible foliation (layering); it often feels slightly soapy or waxy when chlorite content is high. Found globally in mountain ranges and metamorphic shields.
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