sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, grayish-white color, vitreous to dull luster, conchoidal fracture, specific gravity 2.65.
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Physical properties
Hardness 7 on Mohs scale, grayish-white color, vitreous to dull luster, conchoidal fracture, specific gravity 2.65.
Formation & geological history
Formed through the weathering and prolonged aqueous transport of parent igneous or metamorphic rocks, typically occurring in sedimentary environments like riverbeds and beaches.
Uses & applications
Used in landscaping, decorative gravel, and aggregate for construction.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals in Earth's continental crust, allowing it to survive immense transport.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and rounded shape from stream tumbling. Found globally in river gravels and coastal deposits.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Shale (clastic sedimentary rock)
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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