limonite


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Related to limonite: goethite

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 ocherocher
, 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.
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) and as an ore of iron. It is found mainly in Austria and England.

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.

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.
References in periodicals archive ?
As a result of ANTAM's drilling activities, total reserves and mineral resources of saprolite nickel ore at Buli increased by 45% to 93.95 million wmt while limonite nickel ore at Buli increased by 2% to 100.6 million wmt.
The leaching of pyrite and chalcopyrite to malachite azurite hematite and limonite are ubiquitous along these zones while iron ores formed as a result of skarnification are commonly hosted by calcareous rocks within these volcanics.
The Taganito mine, which is the site of the newly commissioned HPAL nickel processing plant, shipped a total of 1.4 million WMT of saprolite ore and 2.5 million WMT of limonite ore, which combined accounted for 28 percent of the NAC's total volume.
Its samprolite nickel ores buyers are Japanese companies such as Pacific Metal, Sumitomo Metal Mining, and Nippon Yakin Kogyo while its limonite nickel ores buyer is an Australian company, Queensland Nickel.
A typical profile of the West Block deposits shows an iron cap extending to 500 mm to 1 m below surface, underlain by the limonite overburden to about 6 m.
There was also a temporary reduction in the deliveries of limonite ore to the Taganito high-pressure acid leaching (HPAL) plant.
These zones contain pyrite chalcopyrite and limonite and hydrothermal alteration products such as chlorite epidote sericite kaolinite and trimolite/sctinolite.
He informed that Korea has abundance of natural resources like coal, limonite, steel, graphite and lead.
This review has indicated the existence of high grade saprolite nickel ore and broader limonite and saprolite mineralisation.
In these new examples the rare Pb-Al phosphate forms botryoidal coatings on earthy brown limonite, and lustrous pale green pyromorphite prisms to a few millimeters each are littered all over the gray-blue to bright baby-blue plumbogummite encrustations.