sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white or off-white color, vitreous to dull luster depending on wear, conchoidal fracture, specific gravity around 2.65
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Physical properties
Hardness of 7 on the Mohs scale, white or off-white color, vitreous to dull luster depending on wear, conchoidal fracture, specific gravity around 2.65
Formation & geological history
Formed through the mechanical weathering, erosion, and transport of quartz-bearing rocks (such as granite or quartz veins) by water or wind over extended geological periods, resulting in rounding.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is exceptionally resistant to both chemical and physical weathering, allowing pebbles to survive long journeys in rivers and beaches.
Field identification & locations
Commonly found in stream beds, river gravels, and beaches worldwide. Can be identified by its high hardness (scratches glass) and lack of cleavage.
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