sedimentary

Weathered iron-rich rock (likely limonite-stained sandstone)

Quartz-rich sandstone with iron-oxide/hydroxide staining; exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Tan to rusty brown, rough and irregular, with dull earthy surfaces and apparent granular texture. Likely dominated by quartz (Mohs 7) and iron oxides such as goethite/limonite (about 5–5.5); crystal structure and specific gravity cannot be determined visually.

Identified October 9, 2026More sedimentary →

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Physical properties

Formation & geological history

If sandstone, it formed from cemented sand grains; iron-bearing groundwater or weathering produced the ochre-brown staining. Its age and precise formation environment cannot be determined from the image.

Uses & applications

An ordinary specimen is mainly suitable for collecting or display; iron-rich sandstone may be used locally as building stone or an iron ore where sufficiently enriched.

Geological facts

The yellow-brown color is consistent with iron oxyhydroxides, often called limonite in hand specimens; this appearance alone does not confirm the rock’s composition.

Field identification & locations

Look for gritty grains and test whether it scratches glass (suggesting quartz); a streak test and closer examination can help distinguish iron staining from other minerals. Sandstone occurs worldwide, but the photo provides no location clues.