sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, off-white, or transparent to translucent, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, off-white, or transparent to translucent, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and prolonged aqueous transport of larger quartz-bearing rocks (like pegmatites or granites), typically found in riverbeds, beaches, and conglomerate sedimentary formations.
Uses & applications
Used in landscaping, decorative gravel, aquarium substrates, and as a common tumbling stone for lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, able to withstand physical weathering and transportation over vast distances.
Field identification & locations
Easily identified by its high hardness (scratches glass), conchoidal fracture, and resistance to chemical weathering. Commonly found worldwide in rivers, streams, and beaches.
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Quartz pebble
Silicon dioxide (SiO2)
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Banded Siltstone / Mudstone Pebble
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