mineral
Quartz vein in host rock
Quartz (SiO₂), likely milky quartz with iron-oxide staining; host rock is uncertain from the photo
AI-generated identification · may be incorrectThe specimen shows pale gray, translucent-to-opaque quartz with a vitreous luster and irregular fracture, embedded in a tan, weathered matrix. Quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage; the host may be softer.
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Physical properties
The specimen shows pale gray, translucent-to-opaque quartz with a vitreous luster and irregular fracture, embedded in a tan, weathered matrix. Quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage; the host may be softer.
Formation & geological history
Likely formed when silica-rich fluids filled fractures and crystallized as a quartz vein, later weathered at the surface. Its age and exact host rock cannot be determined from the image.
Uses & applications
Quartz is used in glass, electronics, abrasives, and decorative stone; this rough piece is mainly suitable for collecting or display.
Geological facts
Iron oxides commonly produce the rusty brown staining visible on quartz-bearing rocks.
Field identification & locations
Look for glassy gray or white areas that scratch glass and do not show cleavage; quartz veins occur in many rock types worldwide. A firm identification of the surrounding matrix requires closer examination.
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