sedimentary

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; predominantly SiO₂

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; cream to white with sparse yellow-brown iron-oxide staining, dull to slightly vitreous luster, and no visible cleavage. Its smooth, oval form is naturally water-worn or tumbled; exact identification requires testing.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely derived from weathered quartz-rich rock and rounded in a stream, beach, or gravel deposit; its original rock may be Precambrian to younger, but age cannot be determined visually. Iron-bearing groundwater commonly produces the yellow stains.

Uses & applications

Primarily a common decorative or collecting pebble, suitable for landscaping and crafts; it has little jewelry or industrial value unless unusually pure, patterned, or confirmed as attractive quartzite.

Geological facts

Quartz-rich pebbles are highly resistant to chemical and mechanical weathering, allowing them to survive transport after softer minerals break down. The orange-brown patches are probably limonite/goethite rather than a distinct gemstone mineral.

Field identification & locations

Check for a glassy fracture and glass-scratching hardness; quartzite usually feels granular and will not fizz with dilute acid. Common in stream beds, beaches, glacial deposits, and gravel pits worldwide.