mineral

Limonite/goethite-rich ironstone (probable)

Limonite, chiefly hydrated iron oxides; commonly goethite, α-FeO(OH), with possible quartz or host-rock inclusions

AI-generated identification · may be incorrect

Dark brown to yellow-brown, earthy to submetallic luster, irregular massive texture, and no obvious cleavage; hardness typically 4–5.5 Mohs, specific gravity about 3.3–4.3. The glossy patches may be natural iron-oxide surfaces or moisture.

Identified August 8, 2026More mineral →

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At a glance

Common name: Limonite/goethite-rich ironstone (probable)
Scientific name: Limonite, chiefly hydrated iron oxides; commonly goethite, α-FeO(OH), with possible quartz or host-rock inclusions
Category: mineral
Identified: August 8, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common specimen; $30–$150+ for attractive botryoidal goethite or documented locality material.

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 through weathering and oxidation of iron-bearing minerals, producing secondary iron-oxide coatings, nodules, and gossan material; it can occur from Precambrian to modern environments. Exact identification is limited by the photograph.

Uses & applications

Used historically as an iron ore and yellow-brown pigment; attractive pieces are collected as specimens. Usually has modest commercial value unless it displays botryoidal goethite, unusual inclusions, or proven locality significance.

Geological facts

Limonite is a field term rather than a single precisely defined mineral, often representing mixtures dominated by goethite. Goethite commonly forms botryoidal, stalactitic, or kidney-shaped masses with brown-yellow streaks.

Field identification & locations

Look for a yellow-brown to reddish-brown streak, high density, and rusty staining; a streak test and hardness test are more diagnostic than appearance. Common in oxidized ore zones, soil horizons, caves, and weathered rocks worldwide.