sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness of 7 on the Mohs scale, typically brown, tan, or yellowish due to iron staining, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown, tan, or yellowish due to iron staining, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
Formation & geological history
Formed from parent igneous or metamorphic rocks that underwent extensive weathering and erosion. The resulting quartz grains or fragments were transported by water and naturally rounded through continuous abrasion in rivers, streams, or beach environments.
Uses & applications
Used primarily in landscaping, decorative stone, and as a raw material in aggregate manufacturing and silica production.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to chemical weathering allows it to survive long transportation journeys where softer minerals are destroyed.
Field identification & locations
Easily identified in the field by its high hardness (it easily scratches glass and steel cannot scratch it) and smooth, water-worn shape. Commonly found in riverbeds, gravel bars, and beaches worldwide.
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Quartz pebble
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