sedimentary

Rounded, iron-stained quartz-rich pebble

Quartz-rich clastic rock, likely quartz sandstone or quartzite; exact identification requires examination beyond the image

AI-generated identification · may be incorrect

Fine-grained, rounded pebble with pale gray-white quartz-rich patches and orange-brown iron-oxide staining; hardness likely about 6–7 Mohs if quartz-dominated, vitreous to dull luster, with no visible cleavage. The image does not establish its precise texture or crystal structure.

Identified October 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from quartz-rich sediment that was cemented or metamorphosed, then rounded by transport in water; its age and original formation environment cannot be determined from appearance alone.

Uses & applications

Primarily a natural pebble or collecting specimen; quartz-rich rock can also be used as aggregate or decorative stone.

Geological facts

The orange-brown coloration is consistent with iron oxides such as goethite or hematite coating or staining the quartz-rich material.

Field identification & locations

Look for a gritty or interlocking quartz texture and hardness sufficient to scratch glass; a fresh broken surface would help distinguish sandstone from quartzite. Quartz-rich pebbles occur widely in river, beach, and glacial deposits.