metamorphic
Rounded light-colored pebble, likely quartz-rich sandstone or quartzite
Unidentified quartz-rich rock; exact identification requires close examination or testing
AI-generated identification · may be incorrectPale gray-beige, fine-grained and matte, with a smooth, rounded surface from abrasion. If quartzite, it is chiefly quartz (SiO₂), Mohs hardness about 7, with no visible cleavage; sandstone is generally softer and may show cemented grains.
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Physical properties
Pale gray-beige, fine-grained and matte, with a smooth, rounded surface from abrasion. If quartzite, it is chiefly quartz (SiO₂), Mohs hardness about 7, with no visible cleavage; sandstone is generally softer and may show cemented grains.
Formation & geological history
The pebble was rounded by transport in water or by other abrasion. Its source rock may have formed as quartz sand cemented into sandstone, later metamorphosed into quartzite; age cannot be determined from the image.
Uses & applications
Small pebbles are used in landscaping and decorative crafts; quartzite is also used as building or aggregate stone.
Geological facts
The image shows a geological specimen, but its uniform fine texture and lack of diagnostic features prevent confident distinction between quartzite, sandstone, and other pale rocks.
Field identification & locations
Check hardness and texture: quartzite commonly scratches glass and has interlocking grains, while sandstone may expose individual grains or crumble. Rounded pebbles occur in streambeds and beaches worldwide.
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