sedimentary

Weathered sandstone

Quartz arenite or feldspathic sandstone (tentative)

AI-generated identification · may be incorrect

Tan, fine- to medium-grained, matte and granular, with prominent bedding or lamination and rounded weathered edges; predominantly quartz with possible feldspar, mica, and iron-oxide cement. Hardness is roughly 6–7 for quartz grains, but the rock may crumble along layers;…

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented in a river, dune, shoreline, or shallow-marine environment; its exact geologic age cannot be determined from the image. The grooves likely expose bedding, cross-bedding, or differential weathering.

Uses & applications

Used as building stone, paving, aggregate, and occasionally decorative landscape stone; this specimen has little jewelry value.

Geological facts

The linear ridges are sedimentary structures rather than crystal faces. Iron-bearing minerals commonly produce the buff-to-reddish coloration seen in weathered sandstone.

Field identification & locations

Common in sedimentary basins worldwide. Confirm by examining a fresh surface with a hand lens: visible sand grains, gritty texture, and possible fizz-free behavior distinguish it from limestone; a steel scratch test may be resisted by quartz-rich grains.