sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or gray in color, vitreous luster, trigonal crystal system, and lack of cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or gray in color, vitreous luster, trigonal crystal system, and lack of cleavage.
Formation & geological history
Formed through mechanical weathering and aqueous transport of primary igneous or metamorphic quartz veins over geological timescales.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to chemical weathering.
Field identification & locations
Found globally in riverbeds, beaches, and conglomerate sedimentary formations; identified by its high hardness and conchoidal fracture.
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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)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary