sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white or off-white color, vitreous to dull luster depending on weathering, 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, vitreous to dull luster depending on weathering, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and erosion of quartz-bearing rocks like granite or quartzite, followed by transportation and rounding in aquatic environments (rivers, beaches) over geological timescales.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and tumbled stones for lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, which is why quartz pebbles are extremely common in riverbeds and beaches.
Field identification & locations
Can be identified by its high hardness (scratches glass), lack of cleavage, and resistance to chemical weathering. Found worldwide in stream beds, beaches, and conglomerate rock formations.
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