sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, translucent to opaque, vitreous to greasy luster, hexagonal crystal system.
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Physical properties
Hardness of 7 on the Mohs scale, translucent to opaque, vitreous to greasy luster, hexagonal crystal system.
Formation & geological history
Formed through the mechanical weathering and fluvial transport of larger quartz veins or igneous rocks over millions of years.
Uses & applications
Used in landscaping, decorative aggregates, and as raw material for glassmaking and silicon production.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, highly resistant to chemical weathering.
Field identification & locations
Identified by its high hardness, lack of cleavage, and smooth water-worn shape; found worldwide 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
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
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