metamorphic
Greenstone
Metabasalt
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, dull to sub-vítreous luster, fine-grained amorphous or crystalline structure, and distinct green color due to chlorite, epidote, or actinolite.
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Physical properties
Hardness of 5-6 on the Mohs scale, dull to sub-vítreous luster, fine-grained amorphous or crystalline structure, and distinct green color due to chlorite, epidote, or actinolite.
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 Precambrian.
Uses & applications
Used locally as decorative landscaping stone, crushed aggregate in road construction, and occasionally carved into ornaments or small sculptures.
Geological facts
Greenstone belts often host significant deposits of precious metals like gold and copper, making them vital targets for economic geology.
Field identification & locations
Easily identified by its characteristic greenish hue and weathered pitted texture; frequently found in glacial till and ancient shields.
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