metamorphic
Greenschist
Greenschist facies metamorphic rock
AI-generated identification · may be incorrectHardness 3-5 on Mohs scale; green color due to chlorite, epidote, and actinolite; sub-metallic to vitreous luster; foliated crystal structure.
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Physical properties
Hardness 3-5 on Mohs scale; green color due to chlorite, epidote, and actinolite; sub-metallic to vitreous luster; foliated crystal structure.
Formation & geological history
Formed through regional metamorphism of mafic igneous rocks like basalt under low-to-moderate temperatures and pressures.
Uses & applications
Used primarily as crushed stone for road construction and occasionally as a decorative facing stone.
Geological facts
The characteristic green color comes from abundant green silicate minerals formed during retrograde or greenschist-facies metamorphism.
Field identification & locations
Identified in the field by its distinct green color and foliated texture; commonly found in ancient orogenic belts.
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