mineral
Milky quartz vein in dark host rock
Quartz (SiO₂), likely occurring as a vein within a fine-grained host rock
AI-generated identification · may be incorrectThe pale, cloudy vein has a vitreous-to-waxy sheen and irregular boundaries; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture. The dark host rock’s identity cannot be determined reliably from this image.
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Physical properties
The pale, cloudy vein has a vitreous-to-waxy sheen and irregular boundaries; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture. The dark host rock’s identity cannot be determined reliably from this image.
Formation & geological history
Quartz-rich fluids filled a fracture and crystallized as the host rock cooled or changed; the image does not establish the specimen’s age or precise setting.
Uses & applications
Quartz is used in glass, electronics, abrasives, and decorative stone; this specimen is mainly of geological or collecting interest.
Geological facts
Milky appearance results from tiny fluid or gas inclusions and other microscopic imperfections within quartz.
Field identification & locations
Look for a hard, glassy vein that scratches ordinary glass and lacks cleavage; quartz veins occur in many rock types worldwide. A close-up or hardness test would help confirm the identification.
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