mineral

Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: Off-white, greyish, tan. Luster: Dull to vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Off-white, greyish, tan
Luster: Dull to vitreous (glassy)

Identified July 26, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Off-white, greyish, tan. Luster: Dull to vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Formation & geological history

Formed through igneous activity or hydrothermal veins, subsequently weathered, eroded, and rounded by water transport in rivers or ocean shores over thousands to millions of years.

Uses & applications

Commonly used in construction aggregate, landscaping, aquariums, glass manufacturing, and as a base material for silicon production.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Rounded quartz pebbles are often key components of sedimentary rocks like conglomerate.

Field identification & locations

Identified by its hardness (can scratch glass), lack of cleavage, and smooth water-worn surface. Found in riverbeds, beaches, glacial deposits, and gravel pits worldwide.