mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Creamy off-white/buff; Luster: Waxy to dull (tumbled/water-worn); Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Creamy off-white/buff
Luster: Waxy to dull (tumbled/water-worn)

Identified July 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Creamy off-white/buff; Luster: Waxy to dull (tumbled/water-worn); Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through crystallization in igneous rocks or hydrothermally, then weathered, rounded, and polished through mechanical abrasion in rivers, stream beds, or ocean beaches over long periods.

Uses & applications

Commonly used as decorative gravel, in landscaping, tumbling for hobbyists, and industrially for silica production in glass and electronics.

Geological facts

Quartz is one of the most abundant minerals in the Earth's crust. Smooth pebbles like this are natural results of fluvial or marine erosion, often called river stones or beach pebbles.

Field identification & locations

Identified by its hardness (scratches glass readily), smooth rounded edges from water action, and lack of distinct cleavage. Found globally in riverbeds, beaches, and sedimentary deposits.