sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, white or off-white color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of around 2.65.

Identified August 4, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, white or off-white color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of around 2.65.

Formation & geological history

Formed through the weathering and prolonged water transportation of quartz-rich rocks like granite or quartzite, typically smoothing out in rivers, streams, or marine environments over millions of years.

Uses & applications

Used in landscaping, decorative aggregates, abrasives, and sometimes tumbled for lapidary arts or gemstone collections.

Geological facts

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

Field identification & locations

Easily identified in the field by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape, commonly found along riverbeds, beaches, and ancient sedimentary deposits worldwide.