mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Tan, white, and translucent; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Tan, white, and translucent
Luster: Vitreous to waxy

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Tan, white, and translucent; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through crystallization of silica-rich hydrothermal fluids or within igneous pegmatites. These specific specimens are water-worn 'river rocks' shaped by erosion over thousands of years.

Uses & applications

Commonly used in landscaping, as decorative aggregate in construction, and occasionally for lapidary work (tumbling). Industrial quartz is used in glassmaking and electronics.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. These pebbles are extremely durable and can survive long-distance transport in rivers and along coastlines due to their high hardness.

Field identification & locations

Look for a translucent to milky appearance and the ability to scratch glass. These rounded pebbles are often found in riverbeds, glacial deposits, and beaches.