limonite (līm`ənīt) or brown hematite (hĕm`ətīt, hē`–), yellowish to dark brown mineral, a hydrated oxide of iron, FeO(OH)·nH2O, occurring commonly in deposits of secondary origin, i.e., those formed by the alteration of minerals containing iron. Both iron rust and bog iron ore are limonite. It serves as a pigment (see ocher ocher (ō`kər), mixture of varying proportions of iron oxide and clay, used as a pigment .
..... Click the link for more information. ) and as an ore of iron. It is found mainly in Austria and England.
One of the major iron minerals, a hydrous ferric oxide of variable composition. Often brown and earthy, it is formed by alteration of other iron minerals, such as the hydration of hematite or the oxidation and hydration of siderite or pyrite.
..... Click the link for more information. ) and as an ore of iron. It is found mainly in Austria and England.
limonite
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Limonite (left) from Ironwood, Mich., and (right) from Montgomery, Pa.
(credit: Courtesy of the Field Museum of Natural History, Chicago; photograph, John H. Gerard/EB Inc.)
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