mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent tan; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent tan
Luster: Vitreous to waxy (when weathered)

Identified April 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent tan; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from cooling magma or hydrothermal veins. This specific specimen is a river-worn pebble, meaning its rounded shape was created through mechanical weathering and transport by water over thousands of years.

Uses & applications

Quartz is used extensively in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative gravel in landscaping.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often survives as pebbles in riverbeds long after other minerals have decomposed.