sedimentary
Quartz Pebbles
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or clear with a vitreous luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or clear with a vitreous luster and conchoidal fracture.
Formation & geological history
Formed through the weathering and prolonged aqueous transportation of parent rocks, resistant to chemical and physical degradation over millions of years.
Uses & applications
Used widely in landscaping, aggregate for concrete, and abrasive manufacturing.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and frequently survives multiple cycles of erosion and deposition.
Field identification & locations
Easily identified in the field by its high hardness (scratches glass) and smooth, rounded surfaces resulting from river or beach tumbling.
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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
fossil
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