sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, transparent to translucent with a vitreous luster, conchoidal fracture, and trigonal crystal system.
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Physical properties
Hardness of 7 on the Mohs scale, transparent to translucent with a vitreous luster, conchoidal fracture, and trigonal crystal system.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz veins or rocks, rounding into smooth pebbles in rivers or beaches.
Uses & applications
Used in landscaping, decorative gravel, aquarium substrates, and as a raw material for silicon production.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Found globally in riverbeds, beaches, and conglomerate sedimentary rocks; identified by its high hardness and lack of cleavage.
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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
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary