sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to yellowish color with greasy to vitreous luster, trigonal crystal system, and no true cleavage with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white to yellowish color with greasy to vitreous luster, trigonal crystal system, and no true cleavage with conchoidal fracture.
Formation & geological history
Formed through the accumulation and prolonged weathering or fluvial transport of durable quartz grains in sedimentary environments.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant and weather-resistant minerals in Earth's continental crust, allowing it to survive long transport cycles as pebbles.
Field identification & locations
Identified easily by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape found in riverbeds and beaches worldwide.
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Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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