sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; white, clear, or yellowish-brown color; vitreous luster; trigonal crystal system; no true cleavage; specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale; white, clear, or yellowish-brown color; vitreous luster; trigonal crystal system; no true cleavage; specific gravity of 2.65
Formation & geological history
Formed from the weathering and erosion of quartz-rich rocks like granite or quartzite, subsequently rounded and smoothed by water transport in rivers or ocean waves over thousands to millions of years
Uses & applications
Used in landscaping, decorative gravel, manufacturing of glass and silicon, and polished as a common lapidary stone
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, capable of surviving weathering processes that break down almost all other primary minerals
Field identification & locations
Found globally in riverbeds, beaches, and conglomerate rock formations; easily identified by its high hardness (scratches glass) and conchoidal fracture if broken
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Quartz pebble
Silicon dioxide (SiO2)
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