sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white or translucent beige in color with a vitreous to waxy luster, and lacks cleavage.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically white or translucent beige in color with a vitreous to waxy luster, and lacks cleavage.

Formed through the mechanical weathering and water-transport smoothing of quartz veins or larger rock bodies over millions of years.

Used in landscaping, decorative stone, tumbling, and as raw material for glassmaking and silicon production.

Quartz is one of the most abundant and durable minerals on Earth's continental crust, surviving erosion better than almost any other mineral.

Identified by its high hardness, conchoidal fracture on fresh surfaces, and common presence in riverbeds and beaches worldwide.

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)