sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, pink, or translucent in color, vitreous luster, conchoidal fracture, trigonal crystal system, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, pink, or translucent in color, vitreous luster, conchoidal fracture, trigonal crystal system, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and erosion of quartz-bearing rocks like granite, followed by prolonged water transport in rivers or beaches that rounds the edges. Geological age varies widely from Precambrian to recent.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, which is why quartz pebbles survive long journeys in riverbeds and shorelines.
Field identification & locations
Found worldwide in stream beds, river gravels, and beaches. Easily identified by its high hardness (scratches glass) and lack of cleavage.
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