sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, variable color (often white, clear, or grey with dark inclusions), vitreous luster, conchoidal fracture, no distinct cleavage, specific gravity of 2.65.

Identified August 1, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, variable color (often white, clear, or grey with dark inclusions), vitreous luster, conchoidal fracture, no distinct cleavage, specific gravity of 2.65.

Formation & geological history

Formed through the mechanical weathering and prolonged transport of quartz-rich rocks (like granite or quartzite) in rivers or marine environments, often millions of years old.

Uses & applications

Commonly used in landscaping, construction aggregate, decorative gravel, and abrasive materials.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering, which is why it often survives as pebbles long after other minerals have eroded away.

Field identification & locations

Found worldwide in stream beds, beaches, and sedimentary deposits. Identify in the field by its high hardness (scratches glass) and conchoidal fracture.