sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or light brown in color, vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or light brown in color, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the weathering and prolonged aqueous transportation of parent igneous or metamorphic rocks.
Uses & applications
Used in landscaping, aggregate for construction, and as raw material for glass manufacturing.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust.
Field identification & locations
Identified by its high hardness, resistance to acid, 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
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)
sedimentary