mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Milky white to light tan; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None (Conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Milky white to light tan
Luster: Vitreous to waxy

Identified June 24, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Milky white to light tan; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None (Conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through hydrothermal processes or from the cooling of magma. This specific specimen has been rounded by mechanical erosion in a fluvial (river) or coastal environment.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a drainage component in construction. Small pebbles like this are often used in decorative landscaping.

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 origins meaning 'hard'.

Field identification & locations

Identify by its hardness (it can scratch glass and steel) and lack of cleavage. Common in riverbeds, beaches, and soil worldwide. Collectors should look for clarity or unique inclusions.