sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or gray with a vitreous luster, amorphous to trigonal crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or gray with a vitreous luster, amorphous to trigonal crystal structure.
Formation & geological history
Formed through the mechanical weathering and water-transport erosion of larger quartz-bearing rocks over extended geological time.
Uses & applications
Used primarily in landscaping, decorative gravel, and occasionally in tumbling and lapidary arts.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Found globally in riverbeds, beaches, and glacial deposits; easily identified by its hardness and conchoidal fracture.
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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)
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