sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically yellowish-brown to white in color, with a vitreous to dull luster and conchoidal fracture.

Identified November 11, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically yellowish-brown to white in color, with a vitreous to dull luster and conchoidal fracture.

Formed through the mechanical weathering and water transport of quartz veins or larger silicate rocks over long periods.

Used in landscaping, aggregate for construction, and as a raw material for glassmaking and silica extraction.

Quartz is one of the most abundant and durable minerals in the Earth's continental crust, highly resistant to chemical weathering.

Identified by its high hardness (scratches glass), smooth water-worn shape, and lack of cleavage; found globally in riverbeds and beaches.

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

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)