igneous
Light-gray river pebble
Indeterminate; likely fine-grained quartz-rich rock such as quartzite or pale granite
AI-generated identification · may be incorrectSmall, rounded, weathered pebble with dull gray-white color and low vitreous luster; apparent hardness roughly 6–7 Mohs, but grain size and cleavage are not resolvable from the image.
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Physical properties
Small, rounded, weathered pebble with dull gray-white color and low vitreous luster; apparent hardness roughly 6–7 Mohs, but grain size and cleavage are not resolvable from the image.
Formation & geological history
Rounded by natural transport and abrasion in a stream, beach, or gravel deposit; its original rock may be Precambrian to Phanerozoic, depending on source geology.
Uses & applications
Typically used as landscaping or decorative gravel; this individual piece has negligible commercial or collector value.
Geological facts
The smooth shape indicates prolonged abrasion, while the pale color may reflect quartz, feldspar, or both. A close inspection or fresh break is needed for reliable identification.
Field identification & locations
Check for visible grains, feldspar cleavage, quartz translucency, and acid reaction; a streak test, hardness test, and magnification would distinguish quartzite from granite, limestone, or concrete. Similar pebbles occur worldwide in riverbeds and glacial deposits.
