sedimentary
Rounded quartz-rich pebble
Likely quartzite or quartz-rich sandstone; predominantly quartz (SiO₂)
AI-generated identification · may be incorrectSmall, water-rounded light-gray pebble with a dull to slightly sugary luster and granular texture; quartz hardness is about Mohs 7, with no obvious cleavage. Exact identification is limited by the photograph.
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Physical properties
Small, water-rounded light-gray pebble with a dull to slightly sugary luster and granular texture; quartz hardness is about Mohs 7, with no obvious cleavage. Exact identification is limited by the photograph.
Formation & geological history
Probably formed from quartz-rich sediment later cemented or metamorphosed, then rounded by stream or beach transport; its original rock age cannot be determined visually.
Uses & applications
Commonly used as landscaping or decorative stone and occasionally in craft or jewelry settings; it has little commercial value at this size.
Geological facts
The pale color and uniformly granular surface suggest abundant quartz, but similar pebbles can be feldspathic sandstone, quartzite, or even weathered limestone.
Field identification & locations
Test with a steel knife or glass: quartz-rich material should resist scratching glass, while limestone will usually fizz with dilute hydrochloric acid. Common in river gravels, beaches, and glacial deposits.
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