sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent, vitreous to dull luster, conchoidal fracture, trigonal crystal system when formed as crystals but water-worn and rounded here, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent, vitreous to dull luster, conchoidal fracture, trigonal crystal system when formed as crystals but water-worn and rounded here, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and prolonged aqueous transportation of parent igneous or metamorphic rocks, commonly found in riverbeds, beaches, and alluvial deposits.
Uses & applications
Used in landscaping, decorative paths, abrasive manufacturing, and silicate glass production.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering, which is why it often survives as durable pebbles after other minerals have eroded away.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape found in stream gravels and beaches.
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Quartz pebble
Silicon dioxide (SiO2)
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