metamorphic
Greenstone
Metabasalt / Greenschist facies rock
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, mottled green and white color due to chlorite and epidote, dull to sub-vitreous luster, and massive to foliated crystal structure.
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Physical properties
Hardness of 5-6 on the Mohs scale, mottled green and white color due to chlorite and epidote, dull to sub-vitreous luster, and massive to foliated crystal structure.
Formation & geological history
Formed through low-grade regional metamorphism of mafic igneous rocks like basalt under high pressure and low temperature.
Uses & applications
Used historically for stone axes and currently as decorative landscape gravel or polished lapidary specimens.
Geological facts
Greenstone is often associated with ancient shield areas and marks ancient subduction zones.
Field identification & locations
Identified by its distinctive greenish color and interlocking mineral grains; commonly found in glacial till and riverbeds.
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