sedimentary
Quartzite Pebble (Microcrystalline Quartz / Chert)
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, waxy to dull luster, reddish-brown to tan color, microcrystalline or granular structure, sub-conchoidal fracture, highly resistant to weathering.
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Physical properties
Hardness of 7 on Mohs scale, waxy to dull luster, reddish-brown to tan color, microcrystalline or granular structure, sub-conchoidal fracture, highly resistant to weathering.
Formation & geological history
Formed as a rounded river or beach pebble through fluvial and mechanical erosion of quartz-rich rocks or chert deposits. Weathering and transport smoothed its surface while preserving small pits and cavities.
Uses & applications
Commonly used in landscaping, construction aggregate, decorative river stone arrangements, or for rock tumbling practices.
Geological facts
River pebbles like this one are often millions of years old, having traveled great distances down streams and glacial paths, which buffed away softer outer mineral layers.
Field identification & locations
Identified by its hard, rounded appearance, lack of reaction to acid, and resistance to scratches by steel (scratches glass easily). Found worldwide in stream beds, beaches, and glacial till deposits.
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