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 ?
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.
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.
The most recent unusual find from Pucarrajo, coming at the end of 2002, was boulangerite as long needles up to about 3 cm, forming a felt-like vein on calcite.
Associated minerals are: scainiite, zinkenite, boulangerite, robinsonite, tintinaite, sorbyite and other incompletely characterized minerals, Other associated minerals are: sphalerite, cinnabar, galena, andorite, bournonite, tetrahedrite, chalcostibite, gersdorffite, barite, cerussite and stibiconite.
Siete Suyos Apatite, boulangerite, bournonite, freibergite, hocartite, jamesonite, pyrite, stannite Siglo Veinte See under Llallagua or XX Sijsihua Nitratine Socavon (also Augelite, bournonite, franckeite, called La chalcostibite, plagionite, pyrite, Salvadora 1) sphalerite, stannite, stibnite, tetrahedrite, wavellite Socavon Carmen Cassiterite, feldspar, muscovite, wolframite Socavon Rosario See Rosario 1 Soracaya Pyrargyrite, tetrahedrite Sorata See Millapaya, Hucumarini, Marcamarcani Sucre Gold, stibnite Tacora Sulfur Tamacaya Boulangerite Taminani Arsenopyrite, tungstite, wolframite Tanapaca (also Arsenopyrite, bismuth, called Mocoya) bismuthinite, cassiterite, gold (Some specimens from here may be labeled Viloco.
Associated minerals are: zinkenite, boulangerite, robinsonite, tintinaite, sorbyite, a new chloro-sulfosalt, sphalerite, cinnabar, galena, andorite, bournonite, tetrahedrite, chalcostibite, gersdorffite, barite, cerussite and stibiconite.
Bindheimite occurs as pale yellow to reddish yellow, earthy masses, crusts and thin coatings covering surfaces up to several square centimeters and as masses of acicular to fibrous pseudomorphs after boulangerite.
Boulangerite has been found rarely in the deep portions of the Nikolaevskiy mine as typical acicular "feather ore," and rarely also at the First Sovietskiy mine.
The carbonate gangue appears at the onset of stage 2b and occurs on nothing later than boulangerite.