sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, yellowish-brown color from iron staining, vitreous luster, cryptocrystalline or microcrystalline structure, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, yellowish-brown color from iron staining, vitreous luster, cryptocrystalline or microcrystalline structure, and conchoidal fracture.
Formation & geological history
Formed through mechanical weathering and fluvial transport of larger quartz veins or rocks, rounding edges over long distances in river or beach environments.
Uses & applications
Used in landscaping, decorative stone, abrasive manufacturing, and rock tumbling or amateur lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness (scratches glass), smooth water-worn shape, and lack of cleavage. Common worldwide in riverbeds, beaches, and alluvial gravel deposits.
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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
fossil
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