mineral

Tumbled quartz pebble

Quartz (SiO₂), likely milky or iron-stained quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; cream-white to pale yellow, translucent, with a vitreous/waxy luster and no visible cleavage. It has a massive, granular structure and likely moderate specific gravity around 2.65.

Identified August 11, 2026More mineral →

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Physical properties

Hardness 7 Mohs; cream-white to pale yellow, translucent, with a vitreous/waxy luster and no visible cleavage. It has a massive, granular structure and likely moderate specific gravity around 2.65.

Formation & geological history

Quartz crystallized from silica-rich igneous or hydrothermal fluids, potentially millions to billions of years ago, then weathered into a rounded pebble. Its smooth shape indicates natural abrasion or tumbling.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and countertops; attractive polished pieces are sold as inexpensive decor or lapidary material.

Geological facts

The yellow coloration may result from iron-oxide staining, surface coating, or slight citrine-like coloration; it is not possible to confirm citrine from the photograph alone.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, rounded form, and ability to scratch ordinary glass; a steel knife should not scratch it. Quartz pebbles occur worldwide in stream gravels, beaches, and quartz-rich rocks.