sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Hardness of 7 on the Mohs scale, white to beige color, vitreous luster, trigonal crystal system, no cleavage, and specific gravity around 2.65.

Identified November 5, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, white to beige color, vitreous luster, trigonal crystal system, no cleavage, and specific gravity around 2.65.

Formed through the weathering and erosion of parent rocks, followed by prolonged water transport and rounding in river or marine environments.

Used in landscaping, decorative pathways, raw material for glassmaking, and polished ornamental stones.

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

Identified by its high hardness, conchoidal fracture, and smooth, water-worn shape; 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)