sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, conchoidal fracture, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, conchoidal fracture, and no cleavage.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz rocks over millions of years.
Uses & applications
Used in landscaping, decorative gravel, and aggregate for construction.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, highly resistant to chemical weathering.
Field identification & locations
Identified by its high hardness which easily scratches glass and its smooth, rounded shape from water tumbling; found globally in riverbeds and beaches.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
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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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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary