sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically yellowish to brown due to iron staining, vitreous luster, and conchoidal fracture.

Identified November 10, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically yellowish to brown due to iron staining, vitreous luster, and conchoidal fracture.

Formed through the weathering and prolonged aqueous transport of quartz veins or granitic rocks, often found in stream beds and alluvial deposits.

Used primarily in landscaping, aggregate, and as a raw material for silicon production.

Quartz is one of the most abundant and durable minerals on Earth's continental crust, surviving weathering that destroys other minerals.

Identified by its high hardness, inability to be scratched by steel, and rounded smooth shape from water tumbling.

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)