mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Yellowish-tan; Luster: Vitreous to waxy (when water-worn); Crystal structure: Hexagonal; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Yellowish-tan
Luster: Vitreous to waxy (when water-worn)

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Yellowish-tan; Luster: Vitreous to waxy (when water-worn); Crystal structure: Hexagonal; Specific gravity: 2.65

Formation & geological history

Formed through crystallization of silica-rich fluids in hydrothermal veins or igneous rocks. This specific specimen shows significant rounding and smoothing characteristic of transport in a river or coastal environment.

Uses & applications

Commonly used in decorative landscaping, as river rock, or as a base material for lapidary tumbling for hobbyists.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its durability and resistance to chemical weathering allow it to survive long-distance transport in river systems.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and smooth, rounded water-worn texture. Often found in glaciofluvial deposits or stream beds.