sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, yellow, or pinkish in color due to weathering, vitreous to greasy 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 white, yellow, or pinkish in color due to weathering, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
Formation & geological history
Formed through the mechanical and chemical weathering of parent rocks like granite or quartzite, where resistant quartz grains are transported by water and rounded into pebbles in riverbeds or marine environments.
Uses & applications
Used in landscaping, aggregate for construction, abrasive materials, glassmaking, and polished as a tumbled stone or lapidary specimen.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving weathering processes that destroy other minerals.
Field identification & locations
Found worldwide in river gravels, beaches, and sedimentary deposits; easily identified by its high hardness (scratches glass) and resistance to acid.
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