sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically smooth and rounded with a vitreous to greasy luster, lacking distinct cleavage.

Identified October 19, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically smooth and rounded with a vitreous to greasy luster, lacking distinct cleavage.

Formed through the physical weathering and water transport of primary quartz-bearing rocks over extended geological timescales.

Used in landscaping, decorative items, and as a raw material in the manufacture of glass and abrasives.

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

Found globally in riverbeds, beaches, and alluvial deposits; identified by its high hardness and smooth water-worn shape.

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)