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 29, 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 erosion of parent rocks, leaving behind durable quartz that is rounded by water transport over long periods.

Used in landscaping, decorative gravel, abrasive manufacture, and glass production.

Quartz is one of the most abundant and chemically resistant minerals in Earth's continental crust, surviving multiple cycles of erosion.

Identified by its high hardness (scratches glass), lack of cleavage, and resistance to acid; commonly found 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)