sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or clear in color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, and specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or clear in color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, and specific gravity around 2.65.
Formation & geological history
Formed through weathering and water erosion of primary igneous or metamorphic rocks containing quartz veins, subsequently rounded by mechanical transport in river beds or wave action along coastlines over thousands to millions of years.
Uses & applications
Commonly used in landscaping, decorative aggregates, filtration systems, and as raw material for glass manufacturing.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering, which allows small pebbles to survive transport over great distances.
Field identification & locations
Found worldwide in river gravels, beaches, and alluvial deposits. Can be easily identified by its high hardness (scratches glass), lack of cleavage, and resistance to acid.
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