sedimentary

Iron-rich sandstone or limonite-bearing rock

Ferruginous sandstone, chiefly quartz (SiO₂) with iron oxides/hydroxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

AI-generated identification · may be incorrect

Hardness roughly 5–7 depending on cement; ochre yellow-brown color, dull to earthy luster, granular texture, and no obvious cleavage. The block appears naturally weathered or sawn, with visible sandy grains and iron staining.

Identified September 7, 2026More sedimentary →

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At a glance

Common name: Iron-rich sandstone or limonite-bearing rock
Scientific name: Ferruginous sandstone, chiefly quartz (SiO₂) with iron oxides/hydroxides such as hematite (Fe₂O₃) and goethite (FeO(OH))
Category: sedimentary
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Typically $1–$15 for an ordinary specimen; attractive naturally patterned pieces may sell for $20–$50.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms when quartz-rich sand is cemented by iron oxides, commonly in oxidizing continental or shallow-marine environments; age cannot be determined from the photograph and may range from Precambrian to recent.

Uses & applications

Used locally as building or paving stone and as a source of pigment or iron-rich aggregate; generally has little jewelry value.

Geological facts

Yellow-brown coloration commonly reflects goethite or hydrated iron oxides, while redder tones usually indicate hematite. A magnet test is typically negative or only weakly responsive unless magnetite is present.

Field identification & locations

Look for gritty grains, rusty streaks, and variable iron cement; it should scratch glass if strongly cemented. Common in weathered sedimentary terrains worldwide, especially arid and tropical regions.