mineral

Tumbled quartz-rich pebble

Quartz (SiO₂), possibly iron-stained or included quartz

AI-generated identification · may be incorrect

Translucent gray, cream, and reddish-brown coloration with a glassy to waxy luster; likely Mohs hardness 7, no obvious cleavage, and conchoidal fracture. The rounded shape and surface sheen indicate tumbling or natural abrasion.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich fluids or igneous/metamorphic rocks, then became a weathered pebble; red-brown areas are likely iron-oxide staining. Quartz is common from Precambrian to modern geological settings.

Uses & applications

Used for abrasives, glass, ceramics, electronics, countertops, and decorative stones; attractive pieces may be sold as inexpensive specimens or cabochons.

Geological facts

Quartz is the second-most abundant mineral in Earth’s continental crust and is piezoelectric. Color variation commonly results from inclusions, microscopic fractures, or iron oxides rather than a different quartz species.

Field identification & locations

Identify it by hardness— it should scratch ordinary glass—plus translucent edges, vitreous luster, and lack of cleavage. Common in river gravels, hydrothermal veins, granites, and metamorphic rocks worldwide.