mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Clear to translucent tan/white; Luster: Vitreous; Crystal Structure: Trigonal (often worn into an amorphous shape); Cleavage: Fractures conchoidally; Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Clear to translucent tan/white
Luster: Vitreous

Identified May 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed from molten magma or hydrothermal veins; subsequent weathering and erosion transport the crystal to rivers or beaches where it becomes a rounded pebble. Age can range from millions to billions of years.

Uses & applications

Used in glassmaking, abrasives, timekeeping (piezoelectric properties), jewelry (gemstones), and construction as an additive for concrete or 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 remains as pebbles long after other minerals have eroded.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its translucent glassy luster. Commonly found in riverbeds, glacial till, and coastal sands.