sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically brown to tan due to iron staining, vitreous luster, and conchoidal fracture with no cleavage.

Identified October 25, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically brown to tan due to iron staining, vitreous luster, and conchoidal fracture with no cleavage.

Formed through the mechanical weathering and fluvial transport of larger quartz veins or igneous rocks over millions of years.

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

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

Identified by its high hardness (scratches glass) and smooth, water-worn shape found abundantly 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)