metamorphic
Greenstone
Metabasalt / Chlorite schist
AI-generated identification · may be incorrectHardness 5-6 on Mohs scale, typically mottled green to grey-green in color with a dull to sub-greasy luster, fine-grained microcrystalline structure.
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Physical properties
Hardness 5-6 on Mohs scale, typically mottled green to grey-green in color with a dull to sub-greasy luster, fine-grained microcrystalline structure.
Formation & geological history
Formed through the low-grade regional metamorphism of mafic igneous rocks like basalt under high pressure and moderate temperature conditions.
Uses & applications
Used historically for making prehistoric stone tools like axes, and occasionally as decorative landscaping stone or low-tier cabochons.
Geological facts
The green color comes from secondary minerals like chlorite, epidote, and actinolite that replace the original pyroxenes and plagioclase.
Field identification & locations
Identify by its distinctive greenish hue and dense, weathered exterior texture; commonly found in ancient shield areas and orogenic belts.
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