metamorphic
Quartz Vein in Greenstone
Metabasalt with quartz (SiO2) veins
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, featuring green to grayish-green base rock with stark white quartz bands. Exhibits a sub-to-vitreous luster and a dense, interlocking crystal structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, featuring green to grayish-green base rock with stark white quartz bands. Exhibits a sub-to-vitreous luster and a dense, interlocking crystal structure.
Formation & geological history
Formed via low-grade regional metamorphism of basaltic volcanic rocks, with later hydrothermal fluids depositing silica into fractures to create quartz veins.
Uses & applications
Used primarily as decorative landscaping stones, raw material for cabochons, and valued as specimen pieces for rockhounds.
Geological facts
Greenstone gets its distinct color from chlorite, epidote, and actinolite minerals formed during sub-seafloor alteration or mountain building.
Field identification & locations
Easily identified in the field by contrasting white quartz veins cutting through a weathered green matrix. Found worldwide in ancient greenstone belts.
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