sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray, brown, or translucent white, vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray, brown, or translucent white, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through mechanical weathering and aqueous transport of parent quartz veins or rocks, rounding into pebbles in stream beds or beaches over millions of years.
Uses & applications
Used in landscaping, decorative gravel, aquariums, and occasionally in abrasive manufacturing.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and physical weathering.
Field identification & locations
Easily identified by its high hardness (scratches glass) and lack of cleavage, commonly found in river gravels and beaches worldwide.
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Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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Sandstone
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Shale
Shale (clastic sedimentary rock)
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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