metamorphic
Quartz Vein in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
AI-generated identification · may be incorrectHardness varies from 6 to 7 due to the quartz component; colors include muted greens, greys, and whitish quartz bands; luster ranges from dull earthy to vitreous on quartz faces; amorphous to crystalline structure.
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Physical properties
Hardness varies from 6 to 7 due to the quartz component; colors include muted greens, greys, and whitish quartz bands; luster ranges from dull earthy to vitreous on quartz faces; amorphous to crystalline structure.
Formation & geological history
Formed through regional metamorphism of basaltic precursors (greenstone) combined with hydrothermal activity that injected silica-rich fluids to form quartz veins.
Uses & applications
Used primarily for educational purposes, rock tumbling, or as a decorative garden stone.
Geological facts
Greenstone is heavily altered basalt where minerals like chlorite, epidote, and actinolite impart the characteristic greenish color.
Field identification & locations
Commonly found in ancient shield areas and mountain belts; identified by the striking contrast of white quartz veins running through a dark green or grey host rock.
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