Scorodite


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scorodite

[′skȯr·ə‚dīt]
(mineralogy)
FeAsO4·2H2O A pale leek-green or liver-brown orthorhombic mineral consisting of ferric arsenate; isomorphous with mansfieldite and represents a minor ore of arsenic.

Scorodite

 

a mineral with the chemical composition Fe[AsO4].2H2O. Scorodite contains 34.60 percent Fe2O3, 49.79 percent As2O5, and 15.61 percent H2O; if it contains more than 16 percent P2O5, it is called phosphoscorodite. Scorodite crystallizes in the orthorhombic system, forming dipyramidal, tabular, or prismatic crystals. Solid earthy aggregates, incrustations, spherulites, and microcrystalline druses are common. Scorodite is pale green, grayish green, or grayish brown in color. It has a hardness of 3.5—4 on the Mohs’ scale, and its density ranges from 3,100 to 3,300 kg/m3.

Scorodite is a mineral from the oxidation zone of deposits containing arsenical pyrites (for example, arsenopyrite) or loellingite. Together with these minerals, it serves as raw material for the extraction of arsenic. In the USSR, scorodite deposits are found in Kazakhstan, Uzbekistan, Transbaikalia, and the Urals; it is also found in the German Democratic Republic (Saxony), the USA, and Brazil.

References in periodicals archive ?
To the contrary, our analyses of primary context samples of ore and smelting products and byproducts recovered at smelting sites such as Huaca del Pueblo Batan Grande have shown that copper-arsenic alloys were deliberately and locally smelted and that arsenic was derived partially, if not predominantly, from scorodite available at the large Cerro Mellizo mine (Merkel et al.
Sorbed As and scorodite are common As species in soil environments and often result from the oxidation of As ore materials such as realgar or arsenopyrite.
It is known that scorodite compounds are favorably formed in acidic solution of Fe (III) and As (V) at high temperature (eg.
Property evaluation involves classic surface sampling, guided by evidence for shearing, tectonic and hydrothermal brecciation, silicification, decalcification, and the presence of secondary iron oxides/hydroxides, jarosite and scorodite.
Greater fame was to come, however, when the world's finest crystals of scorodite were found at the El Cobre mine in a single pocket that yielded about a dozen specimens in 1968.
Scorodite from "Tamdrost" (probably Oumlil, since 2001): highly lustrous, dark blue-green crystals to more than 2 cm.
Of these, Ernesto felt fairly confident in naming scorodite, powellite, lotharmeyerite, and zincroselite, and he suspected that lavendulan, chalcophyllite and sainfeldite were present as well.
A total of several thousand mimetite specimens were recovered, as well as about 30 attractive specimens of scorodite found later in 2003.
Goethite Goyazite Hematite Malachite Molybdenite Monazite Muscovite Opal variety hyalite Plumbogummite Pyrite Quartz Rutile Scheelite Schorl Scorodite Titanite Topaz Table 5.
The first one he showed me was a superb scorodite from Tsumeb which really piqued my interest.
Occurrence: In quartzites associated minerals with: arsenopyrite, scorodite, mimetite, pharmacosiderite, barium-pharmacosiderite and goethite.
Associated minerals are: cobaltite, pyrite, chalcopyrite, quartz, garnet (Al-rich), scorodite and erythrite.