metamorphic
Rounded quartzite pebble
Quartzite; predominantly crystalline SiO₂
AI-generated identification · may be incorrectSmall, water-worn pale cream pebble with a granular, subdued luster and no visible cleavage; quartz hardness is about Mohs 7, with quartzite typically very dense and tough. The image is insufficient to confirm mineral impurities or exact texture.
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Physical properties
Small, water-worn pale cream pebble with a granular, subdued luster and no visible cleavage; quartz hardness is about Mohs 7, with quartzite typically very dense and tough. The image is insufficient to confirm mineral impurities or exact texture.
Formation & geological history
Formed when quartz-rich sandstone recrystallized under heat and pressure, then transported and rounded by water or abrasion; its metamorphic age depends on the source terrain. Common in stream gravels, beaches, and glacial deposits.
Uses & applications
Usually used as a landscaping, decorative, or craft stone; larger quartzite is used for aggregate, countertops, building stone, and occasionally ornamental objects. This small specimen has little commercial value.
Geological facts
Quartzite commonly breaks across quartz grains rather than around them and can be harder and more resistant than its parent sandstone. Its cream color may reflect iron staining or other minor impurities.
Field identification & locations
Identify by testing for hardness against glass, observing a sugary quartz texture, and checking that dilute acid does not noticeably fizz; a close image or fresh surface would improve confidence. Common worldwide, especially in river and glacial gravels.
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