metamorphic
Greenstone
Metabasalt / Chlorite-actinolite schist
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, typically dark green to grayish-green in color, dull to sub-waxy luster, and massive to foliated crystal structure.
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Physical properties
Hardness of 5-6 on the Mohs scale, typically dark green to grayish-green in color, dull to sub-waxy luster, and massive to foliated crystal structure.
Formation & geological history
Formed through the low-grade regional metamorphism of mafic igneous rocks like basalt, typically in ancient greenstone belts.
Uses & applications
Used locally as a decorative stone, aggregate in construction, and historically for prehistoric stone tools.
Geological facts
Greenstone belts often host significant deposits of gold and copper, making them vital targets for mineral exploration.
Field identification & locations
Identified by its distinct green hue caused by chlorite, epidote, or actinolite, and commonly found in ancient cratons worldwide.
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