mineral

Weathered iron-rich rock, possibly limonite-bearing sandstone

Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone

AI-generated identification · may be incorrect

Yellow-brown, earthy to dull luster, porous and irregular; likely hardness about 4–5.5 Mohs, with no obvious cleavage. The image cannot establish crystal structure or specific gravity reliably.

Identified August 8, 2026More mineral →

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At a glance

Common name: Weathered iron-rich rock, possibly limonite-bearing sandstone
Scientific name: Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone
Category: mineral
Identified: August 8, 2026
Method: Standard

AI Estimated Value

$1–$10 for a common loose specimen; $10–$30 if unusually colorful, well formed, or locality documented.

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

Yellow-brown, earthy to dull luster, porous and irregular; likely hardness about 4–5.5 Mohs, with no obvious cleavage. The image cannot establish crystal structure or specific gravity reliably.

Formation & geological history

Forms through oxidation and weathering of iron-bearing minerals, commonly producing ironstone, laterite, or limonite coatings; age depends on the host rock and may range from recent weathering to ancient deposits.

Uses & applications

Used historically as an iron ore and natural ochre pigment; attractive pieces may be kept as inexpensive geological specimens, but it is generally unsuitable for jewelry or construction.

Geological facts

Limonite is not a single mineral but a field term for poorly crystalline hydrated iron oxides, commonly dominated by goethite. Its yellow, ochre, orange, or brown color comes from oxidized iron.

Field identification & locations

Look for a yellow-brown earthy texture, rusty streak, and possible attraction to a strong magnet if magnetite is present; a streak test, hardness test, and specific-gravity measurement would improve identification. Common in weathered soils, iron-rich sediments, and mine dumps worldwide.