Iron ochre

{{Other uses|Ochre (disambiguation)}} {{Other uses|Iron (disambiguation)}} {{use dmy dates|date=December 2025}} {{use British English|date=December 2025}}<!---article is titled using UK spelling---> {{Infobox mineral | image =Mineral Limonita GDFL050.jpg}} '''Iron ochre''' or ''iron ocher'' ({{langx|grc|ὠχρός}}, pale yellow, orange) is one of several minerals found in iron ore.

==Description== The term ''iron ochre'', primarily used among mineral collectors, geologists, miners, and various other related professions,{{cn|date=December 2025}} one of several iron ore minerals,<ref name="kriv">Krivovichev V. G. Mineralogical glossary. Scientific editor A. G. Bulakh. — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. — 556 p. — ISBN 978-5-288-04863-0</ref>{{rp|134}} Common abrasives and pigments with a red-brown or brown-orange hue and the powdery consistency of ochre, were known under this name. The minerals include: * hematite<ref name="Egle">''Thomas Egleston, Ph. D.'' Catalogue of Minerals and Synonyms. — Washington: Government Printing Office, 1887.</ref>{{rp|85}} — Fe₂O₃,<ref name="Sigvald"/>{{rp|212}} a widespread iron mineral, one of the most important iron ores * limonite<ref name="Egle"/>{{rp|85}} — Fe₂O₃·Н₂О,<ref name="Kimmo"/>{{rp|30}} a mixture of secondary natural minerals, iron oxide hydrates * goethite<ref name="Kimmo">''Kimmo Virtanen''. Geological control of iron and phosphorus precipitates in mires of the Ruukki-Vihanti Area, Central Finland. — Geological Survey of Finland, 1994; — 69 p.</ref>{{rp|30}} — α-FeO(OH), a product of weathering of ores, a secondary iron mineral, the main component of limonite, part of brown iron ores * lepidocrocite (also known as "brown iron ochre") — γ-FeO(OH),<ref name="ld">''R. A. Lidin, L. L. Andreeva, V. A. Molochko'', edited by R. A. Lidin. Constants of inorganic substances: reference book. 3-rd ed., stereotypical. — Moscow: Drofa, 2008 г. — 685 p.</ref>{{rp|236}} a secondary mineral, a product of the oxidation of iron ore minerals, found in brown iron ores * ferric oxide<ref name="Sigvald">''Sigvald Linné''. Archaeological Researches at Teotihuacan, Mexico. Sigvald Linne, with a foreword by Staffan Brunius and introduction by George L. — The University of Alabama Press, 2003. — 236p.</ref>{{rp|212}} — Fe₂O₃ (oxides of iron), which also occurs naturally as the mineral magnetite * ferrihydrite<ref name="amo">''A.M.O. Mohamed''. Principles and Applications of Time Domain Electrometry in Geoenvironmental Engineering. — Taylor & Francis, 2006. — 603 p.</ref>{{rp|338}} — Fe₂O₃·0.5H₂O, is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface

== Gallery == <gallery> Hematite.jpg|{{center|Hematite}} LimoniteUSGOV.jpg|{{center|Limonite}} Goethite - Colli Euganei, Italia.jpg|{{center|Goethite}} Lepidocrocite-170212.jpg|{{center|Lepidocrocite}} Eisen(III)-oxid.JPG|{{center|Ferric oxide}} Ferrihydrite.jpg|{{center|Ferrihydrite}} </gallery>

== References == {{reflist}}

== See also == * Ochre * Ochre (disambiguation) * Iron (disambiguation) * Iron(III) oxide * List of inorganic pigments * Red pigments * List of colors * Lead ochres * Antimony ochres * Cobalt ochres * Yellow

{{Set index article}} Category:Set index articles on minerals Category:Iron minerals Category:Oxide minerals Category:Hydroxide minerals Category:Mining terminology Category:Mineral groups