mineral

Limonite-rich ironstone (probable weathered iron ore)

Hydrated iron oxides, chiefly goethite (FeO(OH)) and limonite (variable FeO(OH)·nH₂O), possibly with hematite

AI-generated identification · may be incorrect

Hardness about 4–5.5 Mohs; rusty orange-brown, earthy to dull/submetallic luster, opaque, irregular fracture, and relatively high density (approximately 3.0–4.3). The rough fibrous or botryoidal texture is consistent with iron-oxide alteration.

Identified September 16, 2026More mineral →

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At a glance

Common name: Limonite-rich ironstone (probable weathered iron ore)
Scientific name: Hydrated iron oxides, chiefly goethite (FeO(OH)) and limonite (variable FeO(OH)·nH₂O), possibly with hematite
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a small common specimen; attractive botryoidal or locality-labeled pieces may sell for $15–$75.

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 or hydrothermal precipitation in fractures, soils, and caves; its age depends on the host deposit and may range from recent soil formation to ancient ore deposits.

Uses & applications

Used as iron ore when sufficiently concentrated, and historically as an ochre pigment; ordinary pieces have modest geological-collecting value.

Geological facts

Limonite is a field term rather than a single precisely defined mineral, commonly representing mixtures of hydrated iron oxides. Goethite may produce yellow-brown streak, while hematite typically gives a red-brown streak.

Field identification & locations

Common in oxidized zones of iron deposits worldwide. Check for a yellow-brown to red-brown streak, strong heft, and possible attraction only if magnetite is present; a definitive identification requires streak, density, and ideally X-ray or chemical testing.