Boulangerite


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boulangerite

[bu̇′lan·jə‚rīt]
(mineralogy)
Pb5Sb4S11 A bluish-lead-gray, monoclinic mineral consisting of lead antimony sulfide.

Boulangerite

 

(named for the French mineralogist C. L. Boulanger, died 1849), a mineral, a complex sulfide. Its chemical composition is Pb5Sb4S11 Boulangerite crystallizes in a monoclinic system, forming greatly extended needlelike crystals or, more often, ray-shaped or stringy aggregates. Its color is silver gray to lead gray. Boulangerite has a hardness of 2.5-3.0 on the mineralogical scale, and its density is 6,230 kg/m3. It forms in ore veins of complex polymetallic formations. In the USSR there are deposits of boulangerite in Transbaikalia, Uzbekistan, and the Ukraine. Abroad, there are deposits in Czechoslovakia, the German Democratic Republic, France, Sweden, and the USA. Boulangerite is a secondary lead ore.

References in periodicals archive ?
Boulangerite ([Pb.sub.5][Sb.sub.4][S.sub.11]) ore was collected from Shishy Valley, Chitral (35.84[degrees]N:71.78[degrees]E), Khyber Pakhtunkhwa, Pakistan.
Stage 4 is marked by a mineral assemblage composed of quartz + antimony-lead-silver sulfosalt minerals (Figure 4(r)) that prevailingly include boulangerite and jamesonite, as well as minor bournonite, tetrahedrite, and andorite.
In the Keyue deposit, the ore minerals include sphalerite, galena, pyrite, arsenopyrite, chalcopyrite, tetrahedrite, freibergite, boulangerite, jamesonite, bournonite, and stibnite; the gangue minerals are mainly Mn-Fe carbonate, quartz, and calcite (Figures 4-6); and the supergenesis generates the minerals that prevailingly include ferrohydrite, sardinianite, valentinite, malachite, and siliceous sinter (Figure 7).
However, Boulangerite ore collected from mountains of Pakistan was also found a good source of silver.
Some rare crystals are transparent; others are blue, dark blue, gray or nearly black because of abundant fine inclusions of bournonite or boulangerite.
Gordon (1944) measured a prismatic crystal from the Contacto vein that he concluded was boulangerite.
Other collectible species include: native silver, pyrargyrite, argentiferous tetrahedrite, freibergite, sphalerite, galena, quartz, siderite, pyrite, marcasite, boulangerite, jamesonite, acanthite, cerussite, hawleyite (type locality), barite and anglesite.
Boulangerite may occur as irregular grains enclosed in bournonite from the El Paso mine (Lane, 1976).
Scheelite, tetrahedrite, cassiterite, pyrrhotite and fibrous sulfosalts including jamesonite and boulangerite are locally important and have been collected specifically for their specimen value.
In these cavities many other sulfosalts have been found: guettardite, robinsonite, zinkenite, boulangerite, semseyite, jordanite, tetrahedrite, sulvanite, colusite, famatinite and kesterite.
pyrite, quartz, sphalerite Zhangjiawan & other small mines) Yanzigou Shanxi rutile Yaogangxian Hunan apatite, arsenopyrite, bismuthinite, bornite, boulangerite, bournonite, calcite, cassiterite, chalcopyrite, dolomite, fluorite, jamesonite, mica, pyrite, quartz, rhodochrosite, scheelite, sphalerite, stannite, topaz, wolframite Yianpo Hubei turquoise Yingcheng Hubei gypsum Yujangyan Hubei turquoise Yunchangping Guizhou cinnabar, calcite, dolomite, quartz, (incl.
The final case was filled mostly with fine fluorite miniatures--black fluorite filled with boulangerite inclusions on calcite is a brand-new discovery from Hunan Province.