sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to translucent color, vitreous luster, hexagonal crystal system, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white to translucent color, vitreous luster, hexagonal crystal system, conchoidal fracture.
Formation & geological history
Formed through the accumulation and rounding of quartz grains transported by water in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and glass production.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness, lack of cleavage, and smooth water-worn shape; commonly found in stream beds 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
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary