Rock Identifier
Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral
mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: White to off-white/cream; Luster: Vitreous to waxy (when water-worn); Crystal structure: Trigonal/Hexagonal (though not visible in tumbled state); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness
7 on Mohs scale
Color
White to off-white/cream
Luster
Vitreous to waxy (when water-worn)
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Physical properties

Hardness: 7 on Mohs scale; Color: White to off-white/cream; Luster: Vitreous to waxy (when water-worn); Crystal structure: Trigonal/Hexagonal (though not visible in tumbled state); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & geological history

Formed from silica-rich hydrothermal veins or within igneous and metamorphic rocks. This specific specimen has been rounded and smoothed by fluvial or marine erosion over thousands of years.

Uses & applications

Used in glass making, electronics, and as an abrasive. Smooth pebbles are common in decorative landscaping, aquariums, and as pocket stones for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. White quartz is often called 'Milk Quartz' due to microscopic fluid inclusions trapped during crystal growth.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of reaction to acid. Commonly found in riverbeds, beaches, and glacial till globally.

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