sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown or translucent in water-worn specimens, with a vitreous to waxy luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown or translucent in water-worn specimens, with a vitreous to waxy luster and conchoidal fracture.
Formation & geological history
Formed through mechanical weathering and aqueous transport of quartz veins or larger rock bodies, smoothed over extended periods in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative stone, tumbling, and as a raw material for aggregate in construction.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's surface, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and smooth rounded pebble morphology found commonly in gravel bars 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
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