sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically yellow, brown, or white in color, with a vitreous to greasy luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically yellow, brown, or white in color, with a vitreous to greasy luster and conchoidal fracture.
Formation & geological history
Formed through the accumulation and weathering of durable quartz grains transported by water or wind in sedimentary environments.
Uses & applications
Used in landscaping, decorative gravel, and as a raw material in glassmaking and abrasives.
Geological facts
Quartz is one of the most abundant and weathering-resistant minerals in the Earth's continental crust.
Field identification & locations
Easily identified in the field by its high hardness, lack of cleavage, and resistance to scratching by steel.
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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