sedimentary
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, translucent to opaque brown color, vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, translucent to opaque brown color, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the mechanical weathering and aqueous transport of primary igneous rocks over geological timescales.
Uses & applications
Used in landscaping, decorative items, and occasionally polished for lapidary jewelry.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, surviving weathering that destroys other minerals.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and rounded shape from water tumbling in streams or 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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