sedimentary

Weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic sandstone, possibly ferruginous sandstone

AI-generated identification · may be incorrect

Tan-golden, porous, rough, and crumbly with earthy/dull luster; likely composed mainly of quartz grains cemented by silica, calcite, or iron oxides. Estimated hardness is about 3–6 Mohs, depending on cementation; no visible crystal cleavage or organized crystal structure.

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from compacted and cemented sand in an ancient river, dune, or shoreline environment, with iron-oxide staining producing the yellow-brown color. Geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and decorative landscaping; this small weathered fragment has little commercial value unless locality or fossil content is significant.

Geological facts

The irregular cavities and friable texture may reflect weathering, weak cement, or dissolved grains. Color alone cannot reliably distinguish sandstone from weathered tuff, limestone, or laterite.

Field identification & locations

Test whether individual sand grains are visible and whether it scratches glass; sandstone commonly feels gritty and may leave dust when rubbed. Common worldwide, especially in sedimentary basins; a vinegar test can indicate carbonate cement if it fizzes.