sedimentary

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Tan to cream, rounded, weathered surface with a granular appearance; likely quartz-rich. Quartz has Mohs hardness 7 and a hexagonal crystal structure, but the specimen’s texture and cleavage are not clear enough to determine its rock type confidently.

Identified October 15, 2026More sedimentary →

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Physical properties

Formation & geological history

May be a river- or beach-worn pebble, rounded by transport and abrasion. If quartzite, it formed when sandstone was metamorphosed; if sandstone, it formed from cemented sand grains, with age depending on its source.

Uses & applications

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

Geological facts

Its rounded shape reflects prolonged abrasion, but the photograph alone cannot distinguish quartzite from sandstone or another pale, quartz-rich rock.

Field identification & locations

Look for fused, interlocking grains and a surface that scratches glass to support quartzite; loose sand grains or visible cement suggest sandstone. Quartz-rich pebbles are common in stream and beach deposits.