sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, grey, or translucent in color, vitreous luster, conchoidal fracture, and no true cleavage. Specific gravity is approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, grey, or translucent in color, vitreous luster, conchoidal fracture, and no true cleavage. Specific gravity is approximately 2.65.
Formation & geological history
Formed through the weathering and erosion of quartz-bearing rocks (such as granite or pegmatite), followed by transport via water in rivers or coastal environments where tumbling rounds the edges over geological time scales.
Uses & applications
Used in landscaping, decorative stone, manufacturing of glass and silicon chips, and as aggregate in construction.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, which is why it survives long transport distances to become rounded pebbles.
Field identification & locations
Easily identified by its high hardness (scratches glass) and smooth, water-worn shape found frequently in riverbeds, beaches, and gravel bars.
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Quartz pebble
Silicon dioxide (SiO2)
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Banded Siltstone / Mudstone Pebble
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