igneous
Weathered quartz-rich pebble
Likely quartzite or granitic/granodioritic rock; exact identification is uncertain from the image
AI-generated identification · may be incorrectPale gray-white, rounded and weathered, with a granular texture and dull-to-subvitreous luster. Likely Mohs hardness 6–7; quartz-rich material has no obvious cleavage and moderate-to-high durability.
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Physical properties
Pale gray-white, rounded and weathered, with a granular texture and dull-to-subvitreous luster. Likely Mohs hardness 6–7; quartz-rich material has no obvious cleavage and moderate-to-high durability.
Formation & geological history
Probably a naturally transported and abraded stream, beach, or glacial pebble formed from an older quartz-rich igneous or metamorphic source. Its precise age and formation environment cannot be determined visually.
Uses & applications
Commonly used as landscaping gravel, aggregate, decorative stone, or a teaching specimen; this individual pebble has negligible commercial value.
Geological facts
The rounded shape indicates prolonged abrasion during transport. White speckling may represent quartz and feldspar, while gray patches could be weathered mica or other rock-forming minerals.
Field identification & locations
A hard scratch test against glass, inspection for visible interlocking grains, and a fresh broken surface would help distinguish quartzite from granite. Similar pebbles are widespread in river gravels, beaches, glacial deposits, and crushed-stone environments.
