sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown, tan, or white with a vitreous to dull luster, lacking distinct cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown, tan, or white with a vitreous to dull luster, lacking distinct cleavage.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent quartz veins or igneous rocks.
Uses & applications
Used primarily in landscaping, decorative gravel, and occasionally abrasive manufacturing.
Geological facts
Quartz is one of the most durable and abundant minerals on Earth's surface, resisting chemical weathering over millions of years.
Field identification & locations
Found widely in riverbeds and beaches; identified by its high hardness, conchoidal fracture, and resistance to scratching by steel.
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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