sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or yellowish due to iron staining, 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, clear, or yellowish due to iron staining, 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 weathering and erosion of parent rocks containing quartz veins or pegmatites. Over long periods, river or wave action rounds and smooths the quartz into smooth pebbles.
Uses & applications
Used in landscaping, decorative gravel, aquariums, and occasionally in lapidary work or tumbled stone crafts.
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 distances in river systems and shorelines.
Field identification & locations
Found worldwide in riverbeds, beaches, and glacial outwash. Identified by its high hardness (scratches glass), lack of reaction to acid, and smooth water-worn shape.
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