mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to tan/yellowish due to iron staining; Luster: Vitreous to waxy; Crystal structure: Hexagonal (often massive in pebbles); Cleavage: None (conchoidal fracture).

Hardness: 7 on Mohs scale
Color: Milky white to tan/yellowish due to iron staining
Luster: Vitreous to waxy

Identified June 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms from the cooling of silica-rich magma or through hydrothermal veins. This specific specimen is a water-worn river pebble, likely millions of years old, shaped by fluvial erosion and transport.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as decorative landscaping gravel. Rough pebbles are often used in rock tumblers by hobbyists.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which has origins in Slavic meaning 'hard'.

Field identification & locations

Identified by its ability to scratch glass, its lack of cleavage, and its translucent appearance. Found globally in riverbeds, beaches, and soil. Collectors look for clarity or unique inclusions.