mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale. Color: White to milky with traces of iron oxide staining. Luster: Vitreous (glassy) to waxy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 on the Mohs scale
Color: White to milky with traces of iron oxide staining
Luster: Vitreous (glassy) to waxy

Identified May 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen is a river-worn or glacially rounded pebble, meaning it has been physically eroded and smoothed by water or ice over thousands of years.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative gemstones or landscape gravel.

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. It is chemically very stable and resistant to weathering, which is why it often remains as pebbles after other minerals have dissolved.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), lack of cleavage, and glassy appearance. It is found globally in riverbeds, beaches, and various geological outcrops. For collectors, look for clarity or unique inclusions.