sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, conchoidal fracture, and hexagonal crystal system when unweathered.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, conchoidal fracture, and hexagonal crystal system when unweathered.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent quartz veins or pegmatites.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and glass production.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, surviving countless cycles of erosion.
Field identification & locations
Easily identified by its inability to be scratched by steel and its smooth, rounded river-worn shape.
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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
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