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Limonite (brown iron ore) is a fine-grained or cryptocrystalline mixture of iron oxides and hydroxides which used to be regarded as a separate mineral, and now it is regarded as a type of rock. It is mainly made of goethite, a mineral of the hydroxide class.

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Limonite (brown iron ore) is a fine-grained or cryptocrystalline mixture of iron oxides and hydroxides which used to be regarded as a separate mineral, and now it is regarded as a type of rock. It is mainly made of goethite, a mineral of the hydroxide class. It usually occurs as loose, sallow mass (turf ore, iron sand) or creates compact or porous aggregates (rock ore). Goethite sometimes takes the form of crust, as well as stalactite, kidney-shaped, and nodule dripstones.
It can also be met in the form of concretion. Characteristic goethite's colours are yellow, dark brown, and black.

Elaborated by Barbara Kietlińska-Michalik (The Geological Museum of the Institute of Geological Sciences, Polish Academy of Sciences), editorial team of Małopolska’s Virtual Museums, © all rights reserved

Bibliography:
Jerzy Żaba, Ilustrowana Encyklopedia Skał i Minerałów, Katowice 2010.

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Limonite dripstone

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