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, hexagonal crystal system, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent grey, vitreous luster, hexagonal crystal system, conchoidal fracture.
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 manufacture, and abrasive tumbling.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving erosion cycles that destroy other minerals.
Field identification & locations
Identified by its extreme hardness which scratches glass, lack of cleavage, and rounded stream-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
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