mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Milky white to translucent. Luster: Vitreous (glassy) to greasy. Crystal system: Trigonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous (glassy) to greasy

Identified July 22, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Milky white to translucent. Luster: Vitreous (glassy) to greasy. Crystal system: Trigonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Formation & geological history

Formed in igneous pegmatites, hydrothermal veins, and metamorphic rocks. Over time, weathering and water erosion break down the host rock, smoothing the durable quartz into river or beach pebbles.

Uses & applications

Used in glassmaking, electronics (piezoelectric applications), abrasive products, landscaping, and lapidary tumbling for hobbyists.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to mechanical weathering allows it to survive long river transport.

Field identification & locations

Identified by its extreme hardness (scratches glass, cannot be scratched by steel), lack of cleavage, and smooth water-worn surface. Found globally along riverbeds, beaches, and gravel deposits.