sedimentary

Weathered sandstone or arkose fragment

Clastic sandstone, likely quartz–feldspar-rich (arkose); exact identification requires testing

AI-generated identification · may be incorrect

Tan to pinkish-brown, dull and granular, with visible sand-sized grains and irregular fracture; typically Mohs 6–7 for quartz grains, but the rock is friable. No obvious cleavage; specific gravity commonly about 2.2–2.7.

Identified August 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented by silica, iron oxides, or carbonate; arkose commonly derives from rapidly eroding granite. Its age cannot be determined from the image and may range from Precambrian to modern sedimentary deposits.

Uses & applications

Used as building stone, aggregate, paving material, and occasionally decorative stone; this small weathered fragment has negligible commercial value.

Geological facts

The pink coloration likely reflects feldspar or iron-oxide staining, while darker patches may be weathering or lithic grains. A hand lens can reveal grain sorting, rounding, and cement type.

Field identification & locations

Common in sedimentary basins, riverbeds, road cuts, and areas near granitic uplands. Confirm with a gritty texture, visible cemented grains, lack of strong foliation, and an acid test for carbonate cement; the specimen appears more likely sandstone than limestone or granite.