sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, transparent to translucent, and conchoidal fracture without cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, transparent to translucent, and conchoidal fracture without cleavage.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transport of larger quartz-bearing rocks in sedimentary environments.
Uses & applications
Used in landscaping, aggregate production, and lapidary collections.
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
Identified by its high hardness, inability to be scratched by steel, and lack of cleavage; commonly found in riverbeds and beaches worldwide.
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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
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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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