Yellow Quartz Pebble

Physical Properties

Hardness: 7 on Mohs scale; Color: Yellow to tan; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None/Conchoidal; Specific gravity: 2.65

Formation & Geological History

Formed via hydrothermal activity or crystallization from magmatic cooling, then subsequently eroded and tumbled by river or coastal water movement to create the smooth, rounded shape.

Uses & Applications

Used in decorative landscaping, aquarium gravel, cheap jewelry, and occasionally as an industrial source of silica in glassmaking or electronics if high purity.

Geological Facts

This specimen is a stream-rounded quartz pebble. Quartz is the second most abundant mineral in Earth's continental crust. Its yellow color often results from trace amounts of iron oxidation (limonite).

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and smooth, water-worn texture. Commonly found in riverbeds, beaches, and glacial deposits.

Identified on: 5/2/2026

Mode: Standard