sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, translucent brown-beige color, vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, translucent brown-beige color, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and water-transport rounding of larger quartz veins or rocks in river or marine environments.
Uses & applications
Used primarily in landscaping, decorative aggregates, and as a durable mineral specimen for beginner collections.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and resists weathering exceptionally well.
Field identification & locations
Found abundantly in riverbeds, beaches, and glacial tills; easily identified by its high hardness and lack of cleavage.
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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
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary