sedimentary

Weathered sandstone or arkose pebble

Quartz-rich siliciclastic sandstone; likely arkose if feldspar-rich

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; pale pink, tan, and gray, with a dull earthy luster and visibly granular texture. No obvious cleavage; rounded, weathered clast with iron-oxide staining and possible thin cemented layers.

Identified August 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized quartz and feldspar grains were deposited, compacted, and cemented, commonly in river, alluvial, or desert settings. Its precise geological age cannot be determined from the photograph; surface weathering produced the rounded exterior.

Uses & applications

Primarily a natural gravel or collectible specimen; sandstone is widely used as building stone, paving, aggregate, and occasionally dimension stone. This ordinary pebble has little commercial or jewelry value.

Geological facts

The pink coloration commonly reflects potassium feldspar or iron-oxide coatings, while the darker edge may be a more strongly cemented or finer-grained layer. The smooth shape indicates transport or prolonged weathering.

Field identification & locations

Look for sand-sized grains, layered or massive bedding, and a gritty texture; a hand lens can distinguish quartz from pink feldspar. Common in stream gravels and eroding sandstone terrains worldwide.