metamorphic
Greenstone
Metabasalt
AI-generated identification · may be incorrectHardness 5-6 on Mohs scale. Green, grayish-green, or dark green color due to chlorite, epidote, or actinolite. Dull to sub-vitreous luster with a fine-grained, massive crystal structure.
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Physical properties
Hardness 5-6 on Mohs scale. Green, grayish-green, or dark green color due to chlorite, epidote, or actinolite. Dull to sub-vitreous luster with a fine-grained, massive crystal structure.
Formation & geological history
Formed through the low-grade regional metamorphism of mafic igneous rocks such as basalt or gabbro, often associated with ancient greenstone belts.
Uses & applications
Used locally as crushed stone for construction, road aggregate, and occasionally for carved decorative items or lapidary work.
Geological facts
Greenstone belts are among the oldest rock formations on Earth, frequently dating back over 3 billion years to the Archean eon.
Field identification & locations
Identified by its characteristic green color and fine-grained texture, typically found in ancient shield areas and cratons worldwide.
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