metamorphic
Greenschist
Greenschist (Chlorite-Albite-Epidote Schist)
Hardness: 3.5-4.5 on Mohs scale; Color: Dull green to dark grey-green; Luster: Silky to pearly on cleavage planes; Crystal structure: Foliated/Schistose; Cleavage: Perfect in one direction; Specific gravity: 2.8-3.0.
- Hardness
- 3
- Color
- Dull green to dark grey-green
- Luster
- Silky to pearly on cleavage planes
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Physical properties
Hardness: 3.5-4.5 on Mohs scale; Color: Dull green to dark grey-green; Luster: Silky to pearly on cleavage planes; Crystal structure: Foliated/Schistose; Cleavage: Perfect in one direction; Specific gravity: 2.8-3.0.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks (such as basalt) under low temperature and moderate pressure conditions. Usually associated with orogenic belts.
Uses & applications
Used as decorative stone in landscaping, flagstone for walkways, and occasionally as a source of minor minerals. Historically used for carving in ancient cultures.
Geological facts
The green color is primarily due to the presence of minerals like chlorite, epidote, and actinolite. It represents the 'Greenschist Facies' in metamorphic petrology, indicative of specific pressure/temperature ranges.
Field identification & locations
Identify in the field by its distinct green hue, flaky/foliated texture, and ability to be scratched by a steel nail. Common in mountain ranges and areas with ancient tectonic activity.
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