sedimentary

Tumbled quartz-rich pebble

Quartz (SiO₂), likely a rounded quartzite or quartz-rich sandstone pebble

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; pale tan, cream, and pinkish coloration with a matte-to-waxy luster and very fine granular texture. No visible cleavage; quartz grains are tightly interlocked or cemented, with specific gravity roughly 2.6–2.7.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from weathered quartz-rich rock, transported and naturally rounded by water, then possibly polished or tumbled. Its original rock may be Precambrian to younger, but the specimen’s exact age cannot be determined visually.

Uses & applications

Used as a decorative tumbled stone, craft material, landscaping pebble, or aquarium stone; generally little gemstone value.

Geological facts

The rounded shape indicates abrasion during transport or mechanical tumbling. Iron-oxide staining likely produces the warm tan and orange tones.

Field identification & locations

Identify it by its granular quartz texture, high hardness, lack of cleavage, and inability to scratch it with a steel knife easily; common in river gravels, beaches, and commercial lapidary assortments.