sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, cream, or light tan with a vitreous to greasy luster, and conchoidal fracture.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, cream, or light tan with a vitreous to greasy luster, and conchoidal fracture.

Formed through the mechanical weathering and prolonged aqueous transportation of parent quartz veins or pegmatites.

Used in landscaping, decorative aggregates, tumbling, and educational lapidary collections.

Quartz is one of the most durable and abundant minerals on Earth's continental crust, surviving weathering cycles that destroy other minerals.

Easily identified by its resistance to scratching by steel 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)