anglesite


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Related to anglesite: cerussite, smithsonite

anglesite

(ăng`gləsīt), pale green, blue, yellow-to-white, or colorless mineral, a sulfate of lead, PbSO4, that is formed by oxidation of galenagalena
or lead glance,
lustrous, blue-gray mineral crystallizing usually in cubes, sometimes in octahedrons. It is the most important ore and the principal source of lead.
..... Click the link for more information. , crystallizing in the orthorhombic system and occurring also in granular or massive form. It is widely distributed and commonly associated with galena and other lead minerals. It is a secondary lead ore.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Anglesite

 

lead sulfate, a mineral with the chemical composition PbS04. It contains 73.6 percent PbO. A variety that is rich in BaO (8.45 percent) is called weisbachite, or baritoanglesite. The crystals are orthorhombic, usually tabular, more rarely short columnar or dipyramidal. Angle-site more often forms compact granular or earthy masses. Its color is white with yellow, gray, and green casts caused by impurities; its luster is diamondlike. According to the minerological scale, its hardness is 2.5–3.0; its density is 6,100–6,400 kg per cu m.

Anglesite is formed chiefly in oxidized zones of lead and zinc sulfide deposits, in cases of a change in galena (PbS), often in association with cerussite (PbC03). It is formed hydrothermally under conditions of blending the ore-bearing solutions with surface waters saturated with free oxygen. Anglesite is used as an ore for lead smelting.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

anglesite

[′aŋ·glə‚sīt]
(mineralogy)
PbSO4 A mineral occurring in white or gray, tabular or prismatic orthorhombic crystals or compact masses. Also known as lead spar; lead vitriol.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Together with the anglesite, the cadmium oxalate (CdC2O4) accounts for the opaque, orange-grey crust disfiguring parts of the painting on a macroscopic level.
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As galena was released by erosion from the oxidized vein subcrops, it tended to develop a protective white rind of the Pb sulfate anglesite, and to collect downhill from the vein as a dispersion (float) train.
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CCW minerals specialist Bob Matthews said: ``Although diamonds do not occur naturally here in Wales we have a whole host of other unusual minerals from economic treasures such as Welsh gold, to world rarities like ramsbeckite and tyrolite.`` Some of the highlights include: Parys Mountain,on Anglesey, was once the world's largest copper mine and contains a wide range of minerals including pyrite, galena and the rare anglesite.
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Lead phases detected by X-ray d iffraction include synthetic hydrocerussite ([Pb.sub.3][([CO.sub.3]).sub.2][(OH).sub.2]), synthetic crocoite ([PbCrO.sub.4]), synthetic phoenicochroite ([Pb.sub.2][CrO.sub.4]O), synthetic anglesite ([PbSO.sub.4]), and possible synthetic plattnerite ([PbO.sub.2]).
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These, first briefly described by Knopf (1914), included linarite, caledonite, anglesite, wulfenite, hemimorphite and cerussite.
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Only a few of the phases are stoichiometric minerals (anglesite = Pb sulfate, cerussite = Pb carbonate, galena = Pb sulfide, native Pb = Pb), whereas the others are nonstoichiometric associations of various metals and other elements.
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Other minerals found there include the sulfide minerals chalcopyrite, galena, glaucodot, marcasite, pyrite and sphalerite, as well as anglesite, barite, brochantite, "nail-head" calcite, devilline, dolomite, linarite, malachite, quartz, schulenbergite, serpierite, smolyaninovite and wroewolfeite.
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Small, tabular anglesite crystals on galena have been found, as well as rare sky-blue to sea-green aurichalcite sprays (Middle level), and nondescript coatings of green malachite and pale brown hemimorphite.
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A few years ago some miners/dealers in Morocco found they could take white anglesite crystals, put them in household bleach for a few minutes, and change the color to a very attractive red-orange.
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Desautels, in fact, was still the Curator when the taxpayers in question donated a variety of specimens to the Smithsonian, among them, a sinhalite, a cat's-eye rubellite tourmaline, a couple of euclase crystals, several cerussite specimens, some wulfenite specimens and a few anglesite crystals.
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Matrix specimens show a crumbly mixture of galena, granular anglesite and "limonite," and in some cases these substances form inclusions in the cerussite crystals, making them look darker than they should.
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