mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Yellowish-orange; Luster: Vitreous to waxy (when water-worn); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

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

Identified April 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed from hydrothermal veins or as a primary mineral in igneous rocks. This specific specimen is a water-worn river pebble, likely transported and smoothed by fluvial processes over thousands of years.

Uses & applications

Quartz is used in glassmaking, electronics (piezoelectric properties), and as an abrasive. In this form, it is often used for landscaping, aquarium gravel, or lapidary tumbling.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Yellow varieties can be naturally occurring due to iron impurities or localized radiation, though common river pebbles are often stained by iron oxides.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Found globally in riverbeds, glacial deposits, and beaches. Collectors often use these for rock tumbling to reveal a high-shine interior.