sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown to translucent, vitreous luster, conchoidal fracture, and hexagonal crystal system when unweathered.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown to translucent, vitreous luster, conchoidal fracture, and hexagonal crystal system when unweathered.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transport of primary igneous or metamorphic quartz veins.
Uses & applications
Used in landscaping, decorative gravel, and as raw material for glass manufacturing.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals on Earth's surface.
Field identification & locations
Easily identified by its high hardness, lack of cleavage, and smooth rounded shape found 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
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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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