mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Translucent white to milky; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on the Mohs scale
Color: Translucent white to milky
Luster: Vitreous to waxy

Identified March 7, 2026More mineral →

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Physical properties

Hardness: 7 on the Mohs scale; Color: Translucent white to milky; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from the crystallization of magma or through hydrothermal activity. This specific specimen has been further shaped by mechanical weathering and abrasion in a high-energy environment like a riverbed or shoreline, resulting in its smooth, rounded 'pebble' shape.

Uses & applications

Common quartz is used industrially in glassmaking, abrasives, and as a component in concrete. Smooth pebbles like this are popular for landscaping, home decor, and 'worry stones'. High-purity quartz is essential for timing devices in electronics.

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'. It is piezoelectric, meaning it generates an electrical charge when mechanical stress is applied.

Field identification & locations

Identify in the field by its hardness (it can scratch glass and steel), its lack of cleavage, and its translucent appearance. It is found globally in almost all rock types. For collectors, look for clarity or unique inclusions.