sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, yellowish-brown to tan color due to iron oxide staining, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, yellowish-brown to tan color due to iron oxide staining, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed from pre-existing rocks subjected to weathering and erosion, where quartz is highly resistant and survives long transportation in rivers or marine environments, often taking on a rounded pebble shape over millions of years.
Uses & applications
Used in landscaping, decorative stone, manufacturing of glass and electronics, and as a tumbling rough for lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, making up a large percentage of beach sands and river pebbles worldwide.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and resistance to chemical weathering. Commonly found in riverbeds, beaches, and alluvial deposits.
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Quartz pebble
Silicon dioxide (SiO2)
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