sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, milky, or clear in color, vitreous to greasy luster, trigonal crystal system when formed as crystals, conchoidal fracture with no true cleavage, and a specific gravity of around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, milky, or clear in color, vitreous to greasy luster, trigonal crystal system when formed as crystals, conchoidal fracture with no true cleavage, and a specific gravity of around 2.65.
Formation & geological history
Formed through the mechanical weathering and erosion of quartz-bearing parent rocks such as granite or quartzite, followed by water transport that rounds the edges in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative stone, historical tool making, and as aggregate in construction.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering, which allows quartz pebbles to survive long journeys in river systems.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape found frequently in gravel bars, beaches, and streambeds.
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