igneous
Quartz-rich rock, likely milky quartz vein material
Quartz (SiO₂), possibly massive vein quartz; exact rock identification is uncertain from the photo
AI-generated identification · may be incorrectMostly opaque white-to-tan with brown staining and a dull, weathered surface. Quartz has Mohs hardness 7, a trigonal crystal structure, vitreous luster when fresh, and no cleavage; the specimen appears rounded and massive.
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Physical properties
Mostly opaque white-to-tan with brown staining and a dull, weathered surface. Quartz has Mohs hardness 7, a trigonal crystal structure, vitreous luster when fresh, and no cleavage; the specimen appears rounded and massive.
Formation & geological history
Likely formed when silica-rich fluids deposited quartz in a fracture, then weathering rounded the exposed piece. Its age cannot be determined from appearance alone.
Uses & applications
Common quartz is used in glass, ceramics, and engineered products; attractive pieces may be polished or kept as specimens.
Geological facts
The brown patches may be iron-oxide staining. A fresh broken surface would help distinguish quartz from other pale, quartz-rich rocks.
Field identification & locations
Look for hardness sufficient to scratch glass and fracture surfaces without flat cleavage planes; quartz vein material occurs in many rock types worldwide. The rounded shape suggests transport or prolonged weathering.
