metamorphic
Quartz vein in dark metamorphic rock
Likely quartz-rich vein cutting a biotite- or amphibole-rich metamorphic host; exact host rock cannot be confirmed from the image
AI-generated identification · may be incorrectWhite to translucent quartz contrasts with a dark, coarse-grained host. Quartz has Mohs hardness 7, vitreous luster, and no cleavage; the dark minerals appear platy or granular.
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Physical properties
White to translucent quartz contrasts with a dark, coarse-grained host. Quartz has Mohs hardness 7, vitreous luster, and no cleavage; the dark minerals appear platy or granular.
Formation & geological history
Quartz commonly precipitates from silica-rich fluids in fractures, while the surrounding rock forms through heat and pressure. The specimen’s age and precise formation setting cannot be determined visually.
Uses & applications
Primarily a collector or teaching specimen; quartz veins can also be sources of industrial quartz or, in some settings, metal ores.
Geological facts
Quartz veins occur in many rock types and may form when hot fluids cool and deposit silica in cracks.
Field identification & locations
Look for a hard, glassy white vein cutting a distinctly darker, foliated or granular rock; a field hardness test and closer mineral inspection would help identify the host. Similar specimens occur in metamorphic terrains worldwide.
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