sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, typically white or translucent, vitreous luster, hexagonal crystal system, no cleavage.
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Physical properties
Hardness of 7 on Mohs scale, typically white or translucent, vitreous luster, hexagonal crystal system, no cleavage.
Formation & geological history
Formed by the weathering and aqueous transportation of quartz-rich rocks over millions of years, often deposited in riverbeds or beaches.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and glass production.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identified by its high hardness, conchoidal fracture, and lack of reaction to acid. Commonly found worldwide in alluvial deposits and sedimentary formations.
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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)
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