metamorphic
Tumbled quartzite pebble (likely)
Quartz-rich quartzite; mainly SiO₂
AI-generated identification · may be incorrectSmooth, rounded, pale tan and opaque with a slight polish; quartz has Mohs hardness 7, vitreous luster, and no cleavage. The photo alone cannot confirm its exact mineral composition or identify minor inclusions.
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Physical properties
Smooth, rounded, pale tan and opaque with a slight polish; quartz has Mohs hardness 7, vitreous luster, and no cleavage. The photo alone cannot confirm its exact mineral composition or identify minor inclusions.
Formation & geological history
Quartz-rich sandstone recrystallized under heat and pressure, then rounded by water or tumbling; quartzites occur across a wide range of geological ages.
Uses & applications
Commonly used as a decorative pebble or craft/collecting specimen; quartzite is also used for paving and construction aggregate.
Geological facts
Quartzite is made mostly of interlocking quartz grains, making it harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
A scratch test on an inconspicuous spot may help: quartz-rich material can scratch glass, though this is not definitive. Similar tan pebbles can be other quartz-rich rocks, so locality or testing is needed for a firm identification.
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