metamorphic
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
Hardness varies between 3 and 7 depending on the mineral portion (quartz is 7 on Mohs scale). Color is dark grey-green with white. Luster is vitreous on quartz areas and dull on the host rock. Structure is massive with distinct mineral segregation.
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Physical properties
Hardness varies between 3 and 7 depending on the mineral portion (quartz is 7 on Mohs scale). Color is dark grey-green with white. Luster is vitreous on quartz areas and dull on the host rock. Structure is massive with distinct mineral segregation.
Formation & geological history
Formed through regional or hydrothermal metamorphism of mafic volcanic rocks, accompanied by quartz mineralization in fractures.
Uses & applications
Mostly collected as a geological specimen or used locally in landscaping.
Geological facts
Vein quartz commonly precipitates from mineral-rich hydrothermal fluids traveling through fractures in the Earth's crust under high pressure and temperature.
Field identification & locations
Can be identified by the sharp color contrast between the dark host rock and the white quartz inclusion. Found globally in ancient shield areas and orogenic belts.
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