sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or clear with a vitreous luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or clear with a vitreous luster and conchoidal fracture.
Formation & geological history
Formed through the weathering and prolonged water transport of parent rocks, rounding sharp edges over millions of years.
Uses & applications
Used in landscaping, decorative stone, road construction, and abrasive manufacturing.
Geological facts
Quartz is one of the most abundant and chemically resistant minerals in Earth's continental crust.
Field identification & locations
Found abundantly in riverbeds, beaches, and conglomerate sedimentary rocks; identifiable by its high hardness and lack of reaction to acid.
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Other sedimentary specimens
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