mineral
Tumbled quartz pebble
Quartz (SiO₂), likely milky or iron-stained quartz
AI-generated identification · may be incorrectHardness 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.
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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.
