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 , mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite.
..... 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.
limonite [′lī·mə‚nīt]
Limonite
..... 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.)
limonite [′lī·mə‚nīt]
(mineralogy)
A group of brown or yellowish-brown, amorphous, naturally occurring ferric oxides of variable composition; commonly formed secondary material by oxidation of iron-bearing minerals; a minor ore of iron. Also known as brown hematite; brown iron ore.
limonite
A naturally occurring mineral which is used in high-density concrete because of its high density and water content, making it effective in radiation shielding.
Limonite
collective name for natural cryptocrystalline, partially amorphous mineral aggregates comprising various minerals—hydrous trivalent iron oxides (for example, goethite, hydrogoethite, hydrohematite, lepidocrocite). Limonite is formed under exogenous conditions upon decomposition of pyrite and other iron-bearing sulfides, siderite, and iron silicates. It occurs in gossan, laterite, bog ore, and other similar-type formations. Limonite forms large industrial deposits of high-grade iron ore.
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