sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, transparent to opaque with a vitreous to greasy luster, and conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, transparent to opaque with a vitreous to greasy luster, and conchoidal fracture with no true cleavage.
Formation & geological history
Formed via the weathering and aqueous transportation of larger quartz-bearing rocks, smoothed over long periods in fluvial or marine environments.
Uses & applications
Used primarily in landscaping, decorative aggregates, and as raw material for glass manufacturing.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth, highly resistant to both chemical and physical weathering.
Field identification & locations
Easily identified by its high hardness (scratches glass) and smooth, water-worn shape found abundantly 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
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