{{Short description|Lead sulfide material}} {{Infobox mineral | name = Xilingolite | category = Sulfosalt minerals | boxwidth = | boxbgcolor = | image = | imagesize = | caption = | formula = Pb<sub>3</sub>Bi<sub>2</sub>S<sub>6</sub> | IMAsymbol = Xil<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = 1,231.96 g/mol | strunz = 2.JB.40a | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''C2/m'' | unit cell = a = 13.65 Å, b = 4.07 Å <br/>c = 20.68 Å; β = 93°; Z = 4 | color = Lead grey | habit = Elongated and striated prismatic crystals | twinning = On {001} | cleavage = | fracture = | tenacity = | mohs = 3 (calcite) | luster = Metallic | refractive = | opticalprop = | birefringence = | pleochroism = | streak = Grey | gravity = 7.08 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = opaque | other = | references = <ref name=CanMin>Berlepsch, P.B., Armbruster, T.A., Makovicky, E.M., Hejny, C.H., Topa, D.T., and Graeser, S.G. (2001) The Crystal Structure of (001) Twinned Xilingolite, Pb<sub>3</sub>Bi<sub>2</sub>S<sub>6</sub>, from Mittal-Hohtenn, Valais, Switzerland. Canadian Mineralogist, 39, 1653-1663.</ref><ref name=Mindat>[http://www.mindat.org/min-4336.html Mindat.org]</ref><ref name=HBM>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/xilingolite.pdf |title=Handbook of Mineralogy |access-date=2011-03-09 |archive-date=2020-09-26 |archive-url=https://web.archive.org/web/20200926220040/http://www.handbookofmineralogy.com/pdfs/xilingolite.pdf |url-status=dead }}</ref>}} '''Xilingolite''' is a lead sulfide mineral with formula Pb<sub>3</sub>Bi<sub>2</sub>S<sub>6</sub>.<ref name=CanMin/> It has a hardness of 3, a metallic luster, and usually exhibits a lead-grey color. It is a dimorph of lillianite, exhibiting increased Pb-Bi order and decreased symmetry.<ref name=CanMin/>
Its crystal system is monoclinic, with three axes of unequal length two of which are at an oblique angle to each other while the third axis is perpendicular to the plane formed by the other two.<ref name=CanMin/> Xilingolite is opaque, meaning that its internal structure does not allow for light to be transmitted through it.<ref name=CanMin/> The mineral also exhibits white to blue-tinted-white pleochroism under reflected light.<ref name=CanMin/>
==Discovery and occurrence==
Xilingolite was first described in 1982 for an occurrence in an iron-rich skarn deposit in the Chaobuleng district of the Xilingoa League, Inner Mongolia Autonomous Region, China. Its name is derived from the locality in which it was originally found. Xilingolite is also known to occur in various localities in Valais, Switzerland.<ref name=CanMin/><ref name=Mindat/> At the type locality it occurs associated with magnetite, sphalerite, pyrrhotite, pyrite, arsenopyrite, chalcopyrite, digenite, bornite, molybdenite, galena, native bismuth and bismuthinite.<ref name=HBM/>
==References== {{Reflist}}
Category:Bismuth minerals Category:Lead minerals Category:Sulfosalt minerals Category:Monoclinic minerals Category:Minerals in space group 12
{{sulfide-mineral-stub}}