metamorphic
Greenstone
Metabasalt
AI-generated identification · may be incorrectHardness 5-6 on Mohs scale, typically green or greenish-gray in color due to chlorite and epidote, dull to sub-with waxy luster, and a dense, massive crystal structure with poor cleavage.
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Physical properties
Hardness 5-6 on Mohs scale, typically green or greenish-gray in color due to chlorite and epidote, dull to sub-with waxy luster, and a dense, massive crystal structure with poor cleavage.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks like basalt, typically occurring in ancient greenstone belts dating back to the Archean and Proterozoic eons.
Uses & applications
Used historically for prehistoric stone axes and weapons, as well as decorative landscaping stones and occasionally cabochons for jewelry.
Geological facts
Greenstone belts host some of the oldest exposed rock formations on Earth and are frequently associated with significant gold and base metal deposits.
Field identification & locations
Easily identified in the field by its distinct green hue and fine-grained texture; commonly found in mountainous regions, ancient shields, and glacial stream beds.
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