sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically gray or translucent white with a vitreous luster and conchoidal fracture.

Identified October 17, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically gray or translucent white with a vitreous luster and conchoidal fracture.

Formed through the natural weathering, erosion, and water-tumbles transport of quartz-bearing rocks in rivers or marine environments.

Used as decorative landscaping stones, in aggregate materials, and as tumbled stones for lapidary crafts.

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

Identified by its high hardness which easily scratches glass and lack of cleavage; found globally in stream beds 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

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)