Goethite


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Related to Goethite: limonite

goethite

[′gə‚tīt]
(mineralogy)
FeO(OH) A yellow, red, or dark-brown mineral crystallizing in the orthorhombic system, although it is usually found in radiating fibrous aggregates; a common constituent of natural rust or limonite. Also known as xanthosiderite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Goethite

 

(named in honor of the poet J. W. Goethe), a mineral of the iron hydroxide group; chemical composition FeOOH. It contains admixtures of manganese and aluminum, as well as surplus adsorbed water (hydrogoethite). The mineral crystallizes in a rhombic system, forming columnar, needle-like crystals and their growths, sinter aggregates, and powdery and earthy masses mixed with hydrogoethite, hydrohematite, and other minerals (so-called limonites and bog iron ores). The color is brownish yellow to dark reddish brown. Needlelike crystals of goethite gathered into bundles are called needle ironstone. The hardness of goethite on the mineralogical scale is 5-5.5; density, 4,140-4,280 kg/m3. Goethite in crystals sprouting quartz, together with iron sulfides and other sulfides, is found in hydrothermal deposits, which are numerous in the USSR and abroad. The widest distribution of goethite in nature is associated with supergene and sedimentary deposits of iron ores.

G. P. BARSANOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Essilfie-Dughan, "Transformation of two-line ferrihydrite to goethite and hematite as a function of pH and temperature," Environmental Science and Technology, vol.
These subfacies are extremely fine-grained to fine-grained groundmass of ferruginous kaolinite and goethite / limonite.
Because crystalline hematite has a weak ferromagnetic resonance caused by canting of its anti-ferromagnetically-paired iron spins at 48 GHz and 290 K (8), we anticipate that such resonances may be observable in the polycrystalline iron oxides of corrosion in the range of 30 GHz to 50 GHz and particularly in our antiferromagnetic powders of hematite and goethite. As a first attempt to observe these, we measured the magnitude of reflected wave from the tip of an open coaxial probe known as the Agilent[dagger] slim probe.
Alter the oxidised TAPM samples were extracted for 160 h, the remaining suspended solids were removed by filtration, and enough solid goethite or kaolinite added to the supernatant to provide a mineral surface area of 100 [m.sup.2].
Specific topics of the 20 papers include the significance of nuclear fuel in this century, advanced separation processing of spent nuclear fuel using geologic repositories, dissolution of irradiated nuclear fuel from the Big Rock Point reactor, haze formation and behavior in liquid-to-liquid extraction processes, plutonium peroxide in process chemistry, potential applications of Klaui ligands in actinide separations, applications of ionic liquids in actinide and fission product separations, and the influence of simple organic ligands on the partitioning mechanism of trivalent lanthanum to Goethite. The authors have included a subject index.
The concentration of goethite, the mineral responsible for the yellowish-brown color, decreases exponentially with respect to distance from the fracture.
Consider goethite, the water-bearing iron mineral named for the German poet Johann Wolfgang yon Goethe, who dabbled in mineralogy.
In addition, the XRD results show several minor phases, such as hematite and goethite, which likely occur as inclusions within the heavy mineral grains or as weathering products.