sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or translucent grey, vitreous luster, hexagonal crystal system when formed.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent grey, vitreous luster, hexagonal crystal system when formed.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz rocks in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative gravel, glassmaking, and abrasive materials.
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 (scratches glass) and conchoidal fracture, commonly 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
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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)
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