sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, grey to clear color, vitreous luster, and trigonal crystal system.

Identified October 17, 2026More sedimentary →

Get a report just like this from any photo, free.

Physical properties

Hardness of 7 on the Mohs scale, grey to clear color, vitreous luster, and trigonal crystal system.

Formed through mechanical weathering and aqueous erosion of quartz-bearing parent rocks over millions of years.

Used in landscaping, decorative aggregates, tumbling, and as raw material for glass and silicon production.

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

Identified by its high hardness, lack of cleavage, and smooth water-worn shape found abundantly 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

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)