sedimentary

Weathered sandstone or quartz-rich metasedimentary pebble

Likely quartz arenite (sandstone), possibly weakly metamorphosed; predominantly SiO₂ quartz with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Fine- to medium-grained, tan-gray, dull to slightly gritty surface with probable iron staining; quartz hardness ~7, sandstone typically scratches glass variably, with no obvious cleavage. Rounded, flattened shape and surface weathering suggest a water-worn pebble.

Identified August 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely lithified sand deposited in an ancient river, beach, or shallow-marine setting, then cemented and later eroded into a pebble; precise age cannot be determined from the image. If metamorphosed, it may be quartzite, formed during regional burial and heating.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and landscaping; quartzite is harder and used as construction aggregate and decorative stone. This specimen has little commercial value unless locality or unusual texture is documented.

Geological facts

The rough, granular appearance favors sandstone, while a uniformly hard, sugary texture would favor quartzite. A streak, acid, and hardness test can help distinguish it, though visual identification alone is uncertain.

Field identification & locations

Common worldwide, especially in river gravels and weathered sedimentary terrains; inspect for visible sand grains, bedding, pores, or conchoidal fracture. Estimated value: $1–$10 as an ordinary pebble, or $10–$30 if from a documented notable locality.