sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown or tan due to staining, vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown or tan due to staining, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering, transportation, and rounding of pre-existing quartz-rich rocks in fluvial or marine environments.
Uses & applications
Used in landscaping, decorative aggregates, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth, surviving extensive transport that destroys softer rock fragments.
Field identification & locations
Identify by its high hardness (scratches glass) and smooth, rounded water-worn shape; found worldwide in riverbeds and beaches.
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Other sedimentary specimens
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