metamorphic
Greenschist
Greenschist metamorphic rock (chlorite-epidote-actinolite-albite assemblage)
AI-generated identification · may be incorrectMohs hardness typically 3 to 5 depending on mineral content; green to grey-green color due to chlorite and actinolite; submetallic to greasy luster; foliated schistose structure.
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Physical properties
Mohs hardness typically 3 to 5 depending on mineral content; green to grey-green color due to chlorite and actinolite; submetallic to greasy luster; foliated schistose structure.
Formation & geological history
Formed via regional metamorphism of mafic igneous rocks like basalt or gabbro under low to intermediate temperatures and pressures, typically during mountain-building events.
Uses & applications
Used locally as low-grade crushed stone for construction, road aggregate, and sometimes as decorative dimension stone.
Geological facts
The characteristic green color comes from abundant secondary green minerals like chlorite, epidote, and actinolite formed during retrograde or greenschist-facies metamorphism.
Field identification & locations
Identify in the field by its distinct green hue and prominent foliation or schistosity. Commonly found in ancient or active orogenic belts worldwide.
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