sedimentary

Weathered brown quartz-rich rock, likely sandstone

Quartz-rich sandstone (indeterminate lithology)

AI-generated identification · may be incorrect

Tan-brown, irregular and strongly weathered, with a dull earthy to slightly granular luster; likely composed mainly of quartz with feldspar, lithic fragments, and iron-oxide staining. Apparent hardness is approximately 6–7 where quartz-rich, but the specimen may crumble along weathered surfaces;…

Identified August 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed by burial and cementation of sand grains, followed by oxidation and surface weathering. Its precise geological age and depositional setting cannot be determined from the photograph alone.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative material; this small irregular specimen has mainly educational or collecting value.

Geological facts

The brown coloration commonly results from hematite or limonite coatings on quartz grains. A hand lens can reveal rounded or angular grains and distinguish sandstone from massive quartz or quartzite.

Field identification & locations

Common in sedimentary basins worldwide. Test for grain texture with a hand lens, streak a fresh surface, and use dilute hydrochloric acid only to check for carbonate cement; a definitive identification requires a fresh break or laboratory analysis.