mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Tans, yellows, and translucent whites; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Tans, yellows, and translucent whites
Luster: Vitreous to waxy

Identified April 7, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Tans, yellows, and translucent whites; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen has been smooth-worn by water erosion (fluvial or marine) over thousands of years, typically found in riverbeds or on beaches.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), and construction. Polished pebbles are used for landscaping, decoration, and as 'worry stones' or semi-precious collector items.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. It is highly resistant to chemical and physical weathering, which is why it often survives as rounded pebbles long after other minerals in a rock have broken down.

Field identification & locations

Identify by its hardness (it will scratch glass) and its smooth, rounded, water-worn texture. It is ubiquitous on beaches and in stream beds globally. For collectors, look for clarity or unique color variations.