sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to pinkish or brown color, vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to pinkish or brown color, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the physical weathering and water transport of preexisting quartz-rich rocks over extended geological time periods.
Uses & applications
Commonly used in landscaping, aggregate for construction, and as a pocket specimen for amateur rock collectors.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, surviving weathering that destroys other minerals.
Field identification & locations
Easily identified by its high hardness (scratches glass) and resistance to acid; found globally in stream beds 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
fossil
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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