sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

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

Identified October 28, 2026More sedimentary →

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Physical properties

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

Formed through the weathering and prolonged water transport of parent rocks, rounding sharp edges in rivers or marine environments.

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

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

Identified by its high hardness, inability to be scratched by steel, and smooth, water-worn shape; 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)