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.
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, 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.

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.

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.
References in periodicals archive ?
Together with the anglesite, the cadmium oxalate (CdC2O4) accounts for the opaque, orange-grey crust disfiguring parts of the painting on a macroscopic level.
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.
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.
Parys Mountain on Anglesey was former the world's largest copper mine and contains a wide range of minerals including Pyrite, Galena and the rate Anglesite.
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]).
These, first briefly described by Knopf (1914), included linarite, caledonite, anglesite, wulfenite, hemimorphite and cerussite.
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.
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.
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.
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.
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.
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.