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 ?
The Companys current focus remains on the existing FS for the RKEF plant, but these limonite resources provide the potential to establish a second, complimentary project on the same site in due course.
X-Ray Diffraction Analysis (XRD): X-ray diffraction analysis further complemented the microscopic analysis and confirmeddominance of calcite (CaCO3) and dolomite (Ca, Mg (CO3)2) with subsidiary quartz, muscovite,haematite/ limonite (H/L) and clay (Figure 3a and 3b).
Approximately 100 kg of limonite type lateritic nickel ore obtained from the different places of the Adatepe (Sivrihisar) deposit were reduced to 10 kg by conic methods.
Hydrocracking Marlim vacuum residue with natural limonite.
Spencer(1926) described one of the British Museum's sperrylite specimens as embedded in copper-stained limonite from a brecciated shear zone in banded ironstone (Penge Formation of the Pretoria Series; Button, 1976).
95 million wmt while limonite nickel ore at Buli increased by 2% to 100.
The authorities recently warned people not to be fooled by the rumors, saying that the sand -- composed of limonite, an iron-rich mineral -- has no healing properties and may be contaminated with bacteria.
641 million WMT, or about 64 percent of the volume, were limonite or low-grade ores.
With respect to low-grade limonite ore to both the Coral Bay and Taganito processing plants, which remain linked to LME prices, NAC realized an average of $5.
It is applicable to both limonite and saprolite ores.
These subfacies are extremely fine-grained to fine-grained groundmass of ferruginous kaolinite and goethite / limonite.