sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or translucent, vitreous to greasy 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, gray, or translucent, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of quartz-rich rocks (like granite or pegmatite) in rivers, streams, or marine beach environments over millions of years.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and occasionally in lapidary work or tumbling.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to both chemical and physical weathering, allowing it to survive long transport cycles as pebbles.
Field identification & locations
Found worldwide in riverbeds, lake shores, and beaches. Identify by its high hardness (scratches glass), smooth water-worn shape, and lack of effervescence with acid.
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Sandstone or Siltstone
Arenite (if sandstone)
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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
Lithic fragment / Weathered rock
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Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
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