sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, translucent, or light pinkish-orange in color due to iron staining, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, translucent, or light pinkish-orange in color due to iron staining, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity around 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of larger quartz veins, pegmatites, or igneous rocks, smoothing sharp edges over millions of years.
Uses & applications
Used primarily in landscaping, decorative stone, and as aggregate in construction materials, as well as being a common specimen for casual rock collectors.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Its high resistance to both mechanical weathering and chemical decomposition allows pebble-sized pieces to survive long journeys in rivers and on beaches.
Field identification & locations
Easily identified in the field by its resistance to scratching by a steel knife (hardness 7), lack of cleavage, and smooth, water-worn shape. It is found worldwide in riverbeds, beaches, and glacial deposits.
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Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
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