sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white or off-white color with minor iron staining, vitreous to greasy luster, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white or off-white color with minor iron staining, vitreous to greasy luster, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz veins or igneous rocks, smoothing out into a rounded pebble shape in riverbeds or beaches over long periods.
Uses & applications
Used in landscaping, decorative stone, driveways, and occasionally in glassmaking or abrasive production.
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.
Field identification & locations
Commonly found in stream beds, river gravel bars, and coastal beaches. Easily identifiable by its high hardness (scratches glass) and lack of cleavage.
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