sedimentary

Weathered quartz-rich pebble, possibly sandstone

Indeterminate quartz-rich clastic rock; likely ferruginous sandstone or weathered quartzite

AI-generated identification · may be incorrect

Tan-yellow, fine-grained, dull to weakly earthy luster, rounded by abrasion, with no obvious crystals or cleavage. Likely hardness about 6–7 if quartz-rich; exact composition and specific gravity require testing.

Identified September 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed from cemented quartz sand, or metamorphosed sandstone if it proves very hard, then rounded by stream or beach transport; age cannot be determined visually.

Uses & applications

Common material used as aggregate, fill, landscaping stone, and occasionally as a low-value teaching or collection specimen; not typically suitable for jewelry.

Geological facts

The yellow-brown coloration likely comes from iron-oxide staining. Its porous, granular appearance favors sandstone, while a very hard, glass-scratching surface would favor quartzite.

Field identification & locations

Common in streambeds, beaches, gravel deposits, and weathered outcrops worldwide. Test with a steel file or glass, inspect a fresh break for visible sand grains, and use dilute hydrochloric acid to check for carbonate cement.