sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, typically white, yellow, or translucent, with a vitreous luster and conchoidal fracture.
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Physical properties
Mohs hardness of 7, typically white, yellow, or translucent, with a vitreous luster and conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz-bearing rocks over millions of years.
Uses & applications
Used in landscaping, decorative stone, and sometimes tumbling or lapidary arts.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, highly resistant to chemical weathering.
Field identification & locations
Identified by its high hardness (scratches glass) and smooth, water-worn shape; found globally 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