metamorphic
Greenstone
Metabasalt
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, typically olive-green to dark green with a dull to sub-greasy luster and massive, fine-grained crystal structure.
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Physical properties
Hardness of 5-6 on the Mohs scale, typically olive-green to dark green with a dull to sub-greasy luster and massive, fine-grained crystal structure.
Formation & geological history
Formed through low-grade metamorphism of basaltic volcanic rocks, typically occurring in ancient underwater environments and greenstone belts.
Uses & applications
Used locally as decorative stone, lapidary cabochons, and historically for prehistoric stone tools like axes.
Geological facts
Greenstone belts are among the oldest geological formations on Earth, frequently hosting significant gold and base metal deposits.
Field identification & locations
Easily identified in the field by its distinct greenish hue and fine-grained texture, commonly found in glaciated riverbeds and ancient shield regions.
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