sedimentary

Likely sandstone fragment

Quartz-rich sandstone, likely a friable arkose or subarkose

AI-generated identification · may be incorrect

Tan, porous, and granular with a dull earthy luster; chiefly quartz with possible feldspar, clay, and iron oxides. Typical hardness is about 6–7 for individual quartz grains, but the rock crumbles easily; no visible cleavage.

Identified August 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a sedimentary basin, commonly from river, dune, or beach deposits. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, aggregate, and decorative material; attractive varieties are collected, but this fragment has little gem value.

Geological facts

The specimen appears to be displayed in sand or aquarium gravel, and the image does not show diagnostic bedding or cement clearly. It could also be a weathered limestone or pale tuff without a hardness or acid test.

Field identification & locations

Common worldwide, especially in former river channels, deserts, beaches, and sedimentary basins. Confirm by testing: quartz-rich sandstone scratches glass and does not fizz in dilute hydrochloric acid; limestone fizzes strongly, while friable tuff is generally softer.