sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, yellowish-brown color from iron staining, vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, yellowish-brown color from iron staining, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the weathering and prolonged aqueous transportation of parent quartz veins or igneous rocks.
Uses & applications
Used primarily in landscaping, aggregate, and as a raw material for silicon extraction.
Geological facts
Quartz is one of the most abundant and weather-resistant minerals found in the Earth's continental crust.
Field identification & locations
Easily identified by its high hardness, which can scratch glass, and its smooth, water-worn shape found in riverbeds.
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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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