sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, hexagonal crystal system when formed, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, hexagonal crystal system when formed, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and erosion of quartz-bearing rocks like granite or pegmatite, subsequently rounded by water action in rivers or shorelines over thousands to millions of years.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and as a raw material for glassmaking and silicon production.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, able to withstand weathering that destroys most other minerals.
Field identification & locations
Commonly found in stream beds, beaches, and sedimentary conglomerates. Identified by its high hardness (scratches glass) and lack of cleavage.
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