metamorphic
Quartz Vein in Matrix (Gneiss/Schist)
Silicon Dioxide (SiO2) in Metamorphic Rock Matrix
AI-generated identification · may be incorrectHardness 7 for quartz, variable for host rock matrix; vitreous to dull luster; white to translucent quartz patches embedded in a brownish-gray, fine-to-medium-grained crystalline matrix; irregular cleavage; vitreous/translucent quartz patches contrast with dark iron/feldspar weathering.
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Physical properties
Hardness 7 for quartz, variable for host rock matrix; vitreous to dull luster; white to translucent quartz patches embedded in a brownish-gray, fine-to-medium-grained crystalline matrix; irregular cleavage; vitreous/translucent quartz patches contrast with dark iron/feldspar weathering.
Formation & geological history
Formed through hydrothermal deposition of silica-rich solutions filling fractures within metamorphic host rocks such as gneiss or schist under elevated temperature and pressure.
Uses & applications
Primarily collected as a landscape specimen or educational sample; quartz-bearing rocks are used in construction aggregate, silica extraction, and decorative stonework.
Geological facts
Quartz veins often act as host zones for precious metal mineralization, including native gold and copper, which precipitate from hydrothermal fluids alongside the quartz.
Field identification & locations
Can be identified by the milky white quartz patches showing glass-like fracture surfaces surrounded by darker, weathered metamorphic host rock. Commonly found in glaciated riverbeds, mountain zones, and metamorphic terrains.
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