sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically yellow to brown due to iron staining, waxy to vitreous luster, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically yellow to brown due to iron staining, waxy to vitreous luster, conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and water-transport erosion of primary quartz veins or igneous rocks over millions of years.
Uses & applications
Used in landscaping, decorative gravel, and abrasive manufacturing.
Geological facts
Quartz is one of the most abundant and stable minerals on Earth's continental crust, highly resistant to chemical weathering.
Field identification & locations
Identified by its high hardness (scratches glass) and smooth, rounded shape found in riverbeds and beaches.
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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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Sandstone or Siltstone
Arenite (if sandstone)
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone
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Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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