igneous
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veins in metamorphic/igneous host rock
Hardness of 7 on the Mohs scale for the quartz veins, color is grey/brown host rock with white quartz infills, vitreous luster for quartz, trigonal crystal system, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale for the quartz veins, color is grey/brown host rock with white quartz infills, vitreous luster for quartz, trigonal crystal system, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed when hydrothermal fluids rich in silica circulated through fractures and faults in pre-existing rocks, eventually precipitating and crystallizing quartz to fill the voids.
Uses & applications
Commonly collected as geological and mineral specimens, used in decorative landscaping, and studied in structural geology to understand tectonic stress history.
Geological facts
Vein structures like this are the primary geological mechanism for the formation of many gold and metal ore deposits, where precious metals precipitate alongside the quartz.
Field identification & locations
Easily identified in the field by stark white crystalline veins cutting sharply through a darker, contrasting host rock. Look for road cuts, mountain outcrops, and areas with past hydrothermal activity.
