mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Tan, creamy white, or peach (stained by iron oxides); Luster: Vitreous to waxy (smooth when water-worn); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Tan, creamy white, or peach (stained by iron oxides)
Luster: Vitreous to waxy (smooth when water-worn)

Identified June 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in various geological environments, primarily igneous and metamorphic, later weathered and transported by water (streams or beaches) to create a rounded, polished shape. Common throughout Earth's crust across all geological ages.

Uses & applications

Used in construction aggregates, as landscaping stone, and in glass making. Smooth pebbles are popular for home decor, vase filler, and as decorative river rocks.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which has Slavic roots. It is highly resistant to chemical and physical weathering, which is why it often remains as pebbles long after other rocks have eroded.

Field identification & locations

Identified by its ability to scratch glass and smooth, somewhat translucent appearance. Can be found in almost any riverbed or beach globally. Collectors look for unique inclusions or distinct coloration.