sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, white or off-white color, vitreous to dull luster, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, white or off-white color, vitreous to dull luster, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed through the mechanical weathering and erosion of quartz-bearing rocks like granite, followed by transportation and rounding in aquatic environments over geological time scales.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and by mineral collectors.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Pebbles like this have been smoothed by water action in rivers or beaches.
Field identification & locations
Found worldwide in riverbeds, beaches, and sedimentary deposits. Easily identified by its high hardness (scratches glass) and lack of cleavage.
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Quartz pebble
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