sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically colorless or white to brownish due to impurities, vitreous luster, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically colorless or white to brownish due to impurities, vitreous luster, conchoidal fracture.
Formation & geological history
Formed through the physical weathering and water transport of larger quartz rocks, smoothing rough edges over long periods in rivers or beaches.
Uses & applications
Used in landscaping, decorative pathways, and as aggregate in construction materials.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Identify by its high hardness (scratches glass) and smooth, rounded shape found in stream beds and gravel deposits.
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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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