sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or translucent grey, vitreous luster, and conchoidal fracture with no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent grey, vitreous luster, and conchoidal fracture with no cleavage.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transport of parent rocks, rounding sharp edges into smooth clasts over millions of years.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and as raw material for glassmaking and silicon production.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust and is exceptionally resistant to chemical weathering.
Field identification & locations
Found abundantly in riverbeds, beaches, and sedimentary conglomerates worldwide; identifiable by its high hardness and lack of cleavage.
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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
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary