mineral

Yellow Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Yellow to tan
Luster: Vitreous to waxy

Identified May 2, 2026More mineral →

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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.

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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Metamorphic Rock

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mineral