metamorphic
Rounded quartzite pebble
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectPale gray-beige with faint bands and a matte, weathered surface; quartz has Mohs hardness 7, vitreous luster when fresh, and a hexagonal crystal structure. The pebble’s grains are too fine to identify confidently from the image; quartz has no cleavage and specific gravity about 2.65.
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Physical properties
Pale gray-beige with faint bands and a matte, weathered surface; quartz has Mohs hardness 7, vitreous luster when fresh, and a hexagonal crystal structure. The pebble’s grains are too fine to identify confidently from the image; quartz has no cleavage and specific gravity about 2.65.
Formation & geological history
Usually forms when quartz-rich sandstone is metamorphosed and its grains fuse together; its age depends on the source formation and cannot be determined visually. Subsequent erosion and transport rounded the specimen.
Uses & applications
Commonly used as crushed aggregate, road material, and decorative landscaping stone; this small pebble has little commercial or jewelry use.
Geological facts
Quartzite is hard enough to scratch glass and typically breaks through grains rather than around them.
Field identification & locations
Look for a hard, quartz-rich rock with a sugary texture and no obvious cleavage; common in river gravels, beaches, and regions with metamorphosed sandstone. The image alone cannot confirm quartzite over other pale, fine-grained rocks.
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