sedimentary

Small weathered rock fragment, likely iron-stained sandstone

Probable quartz-rich sandstone (dominant mineral: SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Tan to ochre, dull and rounded, with a rough, granular surface. Likely Mohs hardness around 6–7 if quartz-rich; no distinct crystal faces or cleavage are visible.

Identified September 26, 2026More sedimentary →

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Physical properties

Tan to ochre, dull and rounded, with a rough, granular surface. Likely Mohs hardness around 6–7 if quartz-rich; no distinct crystal faces or cleavage are visible.

Formation & geological history

Sandstone forms when sand grains are compacted and cemented, often by silica, calcite, or iron oxides; its age and specific formation environment cannot be determined from the photograph.

Uses & applications

A fragment this small has no evident industrial or jewelry use; it may be kept as a common field specimen.

Geological facts

Iron-oxide staining commonly gives sandstone yellow, tan, or rusty colors. The image does not show enough diagnostic detail to distinguish sandstone confidently from other weathered rocks.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; a scratch or acid test may help assess composition but is not conclusive alone. Sandstone occurs widely in sedimentary regions worldwide.