Rock Identifier
Quartz pebble (Silicon dioxide (SiO2)) — mineral
mineral

Quartz pebble

Silicon dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster (often dulled in weathered pebbles), trigonal crystal structure (though massive or microcrystalline forms are common in pebbles), no cleavage, conchoidal fracture, specific gravity around 2.65.

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Physical properties

Hardness of 7 on the Mohs scale, typically white or translucent, vitreous luster (often dulled in weathered pebbles), trigonal crystal structure (though massive or microcrystalline forms are common in pebbles), no cleavage, conchoidal fracture, specific gravity around 2.65.

Formation & geological history

Formed in igneous, metamorphic, and sedimentary environments. Pebbles are shaped by mechanical weathering and water transport in rivers or on beaches over thousands to millions of years.

Uses & applications

Used in landscaping, construction aggregates, decorative gravel, and sometimes in tumbled stone collections or lapidary work.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its high hardness and lack of cleavage make it highly resistant to mechanical and chemical weathering, which is why quartz pebbles are so common.

Field identification & locations

Can be identified by its hardness (scratches glass) and conchoidal fracture. Common in riverbeds, beaches, and glacial deposits globally.

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