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n.1.(Min.) A mineral of a bluish gray color and metallic luster, usually in plumose masses, also compact. It is a sulphide of antimony and lead.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The mineralogical composition of ore (Table-2) obtained by X-ray diffraction analysis confirms the presence of stibnite (Sb2S3), quartz (SiO2), pyrite (FeS2), boulangerite (Pb5Sb4S11), calcite (CaCO3), barite (BaSO4) and clay minerals.
Based on these previous studies, a low toxicity and low-corrosiveness solution of ammoniumthiocyanate was thus used in the current work as lixiviant to extract gold from boulangerite ores.
The Mn-Fe carbonate during this stage recrystallized to different degree (Figures 4(f), 4(g) and 4(i)-4(k)), some even formed the druse containing the idiomorphic columnar quartz, needle-like boulangerite, or valentinite (Figure 4(j)).
They can be weakly mineralized in places with arsenopyrite, pyrite and rare jamesonite and boulangerite in a quartz gangue.
Locally present are stibnite and chalcopyrite, as are lesser distributions of pentlandite (Ni,FeS), arsenopyrite, boulangerite (5PbS.2[Sb.sub.2][S.sub.3]), bournonite (2PbS.[Cu.sub.2]S.[Sb.sub.2][S.sub.3]) and cinnabar.
The Krinj stibnite and Awirath Gol boulangerite ocurrences, both in Chitral, are good examples of mineralization along thrust planes.
Nine sphalerite, five galena, three boulangerite, two chalcopyrite, two pyrite, and one stibnite samples were chosen for S isotopic analyses, and five galena, two boulangerite, and one stibnite samples were selected for Pb isotopic analyses.
Summary: Novel modified electrochemical method were used to analyze sedimentary, metamorphic, igneous, fined grained, coarse grain granite, granite with feldlaths and ferrogenous sand stone rocks along with boulangerite, stibnite, magnetite and scheelite ores for the presence of silver.
Boulangerite is found at Trepca as fibrous and very thin acicular gray crystals entangled in downy masses informally called "plumosite." It is generally implanted on rhodochrosite aggregates, within geodes made of rhodochrosite and other minerals, on galena and pyrite, and frequently as microscopic inclusions in calcite which color the calcite gray or dark blue.
Using an X-ray spectrometer as the main device in the mineralogical study, the effects of pulp properties (in soda or lime environment) and flotation kinetics were evaluated: gudmundite (FeSbS) is depressed in soda as well as in a lime environment; boulangerite ([Pb.sub.5][Sb.sub.4][S.sub.11]) gives better results in a soda environment; bournonite ([CuPbSbS.sub.3]) floats very well in both environments and is near to chalcopyrite in its properties.
They are of miniature and cabinet-size, with flaring, flat, fanlike groups of bladed crystals of berthierite intermixed with long prisms of stibnite, and this substrate is partially covered by lawns of acicular berthierite crystals with fuzzy spheres of boulangerite to 5 mm topping the assemblage.
Late in 2005 at San Jose/Itos, miners encountered a series of pockets which yielded small but fine specimens in which lenticular andorite crystals perch, like little ears, all over sharp, equant, twinned crystals of stannite; these specimens were found as floaters enclosed in acicular boulangerite, and liberated simply by blowing away the boulangerite "fluff." The gray andorite crystals reach 1 cm, and a few are blessed with a bright metallic luster.