sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, transparent to translucent with a vitreous luster, and conchoidal fracture without cleavage.

Identified November 15, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, transparent to translucent with a vitreous luster, and conchoidal fracture without cleavage.

Formed through the accumulation and mechanical weathering of quartz grains in riverbeds, beaches, or alluvial deposits over millions of years.

Used in landscaping, decorative ground cover, and aggregate for construction.

Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering.

Easily identified by its high hardness which scratches glass and its smooth, rounded shape caused by water transport.

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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock