sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, clear, or yellowish due to iron staining, with a vitreous luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or yellowish due to iron staining, with a vitreous luster and conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and fluvial transport of larger quartz rocks, resulting in smooth, rounded pebble shapes.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and occasionally as a tumbling stone for lapidary work.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals on Earth's surface, allowing it to survive extensive river transport.
Field identification & locations
Easily identified by its high hardness which scratches glass and lack of cleavage; commonly found in riverbeds, beaches, and conglomerate rock formations.
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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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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary