sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Off-white to light tan, translucent to opaque. Luster: Dull to vitreous. Structure: Trigonal crystal system, rounded by erosion.

Hardness: 7 on Mohs scale
Color: Off-white to light tan, translucent to opaque
Luster: Dull to vitreous

Identified July 22, 2026More sedimentary →

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Physical properties

Hardness: 7 on Mohs scale. Color: Off-white to light tan, translucent to opaque. Luster: Dull to vitreous. Structure: Trigonal crystal system, rounded by erosion.

Formation & geological history

Formed through mechanical weathering and stream or beach erosion of quartz-bearing rocks like granite or quartzite.

Uses & applications

Commonly used in landscaping, river rock aggregate, aquariums, and decorative gravel.

Geological facts

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

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and smooth rounded pebble morphology. Found in stream beds, riverbanks, and beaches worldwide.