sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, trigonal crystal system, and conchoidal fracture with no cleavage.

Identified October 22, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster, trigonal crystal system, and conchoidal fracture with no cleavage.

Formed through the weathering and prolonged aqueous erosion of quartz-bearing parent rocks in stream or marine environments.

Used in landscaping, decorative stone, abrasives, and as a raw material for glass manufacturing.

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

Easily identified by its high hardness (scratches glass), lack of cleavage, and rounded shape 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)