sedimentary

Likely sandstone or weathered quartz-rich rock fragment

Quartz-rich sandstone; exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Yellow to ochre, dull and granular, with an irregular fractured surface; likely Mohs hardness about 6–7 if quartz-rich, with no visible cleavage. Grain texture and streak would help distinguish sandstone from a yellow mineral such as sulfur or an industrial material.

Identified August 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Sandstone forms when sand-sized grains—commonly quartz—are compacted and cemented, typically in rivers, dunes, beaches, or shallow-marine settings over millions of years. The specimen may also be a weathered fragment of another iron-stained silicate rock.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and sometimes decorative material; small fragments generally have negligible commercial value.

Geological facts

The yellow color may result from iron-oxide staining, but lighting and surface coatings can be misleading. A close-up, hardness test, streak test, and view of a fresh broken surface are needed for reliable identification.

Field identification & locations

Look for visible sand grains, a gritty feel, and lack of metallic luster; quartz-rich material should not be scratched by a steel knife easily. Common worldwide, especially in sedimentary basins and sandstone outcrops.