mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent grayish-tan; Luster: Vitreous to waxy when water-wet or smooth; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline to coarse crystalline); Cleavage: None, conchoidal fracture

Hardness: 7 on Mohs scale
Color: Translucent grayish-tan
Luster: Vitreous to waxy when water-wet or smooth

Identified July 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed through alluvial or glacial action that eroded larger quartz veins or quartzite rocks, smoothing and rounding the fragment through continuous water and abrasive transport over long geological periods.

Uses & applications

Used in lapidary work for rock tumbling, decorative gravel, landscaping, or as a common sample for beginner rockhounds.

Geological facts

Quartz is one of the most abundant and durable minerals on Earth's surface. Rounded pebbles like this are natural indicators of ancient or active riverbeds and beach environments.

Field identification & locations

Identified by its scratch resistance against steel (Mohs 7), lack of cleavage, translucent appearance, and smooth water-worn surface. Found globally in rivers, beaches, and glacial till deposits.