sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to off-white color, vitreous luster, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white to off-white color, vitreous luster, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and water-transport erosion of primary quartz-bearing rocks over millions of years.
Uses & applications
Used primarily in landscaping, aggregate production, decorative stone, and abrasive manufacturing.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals on Earth's continental crust.
Field identification & locations
Easily identified by its high hardness (scratches glass) and smooth, water-worn 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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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)
sedimentary