mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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
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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.
