sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and trigonal crystal system. Typically translucent to opaque with a smooth, water-worn surface.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and trigonal crystal system. Typically translucent to opaque with a smooth, water-worn surface.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transport of larger quartz-bearing rocks, smoothing sharp edges over millions of years.
Uses & applications
Commonly used in landscaping, decorative aggregates, and as a natural talisman or pocket stone for collectors.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Easily identified by its high hardness, inability to be scratched by steel, and smooth, rounded pebble morphology found in riverbeds 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
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary