sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or gray color with a vitreous to dull luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or gray color with a vitreous to dull luster, and conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz rocks over millions of years.
Uses & applications
Used in landscaping, decorative stone, and as aggregate in construction materials.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving extensive erosion.
Field identification & locations
Identified by its high hardness, smooth rounded shape from river tumbling, and lack of cleavage. Found worldwide in stream beds 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)
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Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary