mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: White, milky, or translucent; Luster: Vitreous to waxy (when river-worn); Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, milky, or translucent
Luster: Vitreous to waxy (when river-worn)

Identified April 8, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, milky, or translucent; Luster: Vitreous to waxy (when river-worn); Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or as a primary constituent of igneous rocks like granite. This specific specimen is a 'river pebble,' meaning it has been mechanically weathered and rounded by water transport over centuries.

Uses & applications

Abrasives, glass manufacturing, electronics (piezoelectric properties), and commonly used as decorative landscaping stone or as a pocket stone/worry stone.

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 in the field by its hardness (it will scratch glass) and lack of cleavage. It is found globally in riverbeds, beaches, and glacial till. Collectors value smooth, perfectly rounded, or highly translucent specimens.