sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; color ranges from translucent white to beige and brownish tones due to iron staining; vitreous to greasy luster; crystal structure is trigonal; conchoidal fracture with no true cleavage; specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; color ranges from translucent white to beige and brownish tones due to iron staining; vitreous to greasy luster; crystal structure is trigonal; conchoidal fracture with no true cleavage; specific gravity around 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged wave or river erosion of primary quartz veins or igneous and metamorphic source rocks, resulting in smooth, rounded pebble shapes.
Uses & applications
Used in landscaping, decorative gravel, aquarium substrates, and occasionally lapidary work.
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 it to survive long journeys in riverbeds and on beaches.
Field identification & locations
Found worldwide in river gravels, beaches, and alluvial deposits. Easily identifiable by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn texture.
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Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
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Sedimentary Sandstone
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Banded Siltstone / Mudstone Pebble
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