sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, pale yellowish-brown color, vitreous luster, trigonal crystal system, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, pale yellowish-brown color, vitreous luster, trigonal crystal system, and no cleavage.
Formation & geological history
Formed through the weathering and prolonged river or wave erosion of quartz-bearing parent rocks.
Uses & applications
Used in landscaping, decorative gravel, and sometimes tumbling or lapidary projects.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth, resisting weathering better than almost any other mineral.
Field identification & locations
Easily identified by its high hardness (scratches glass) and conchoidal fracture, commonly found in riverbeds and beaches worldwide.
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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
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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