{{Short description|Secondary mineral of the alunite group}} {{Infobox mineral | name = Beudantite | category = Arsenate minerals | image = Beudantite-ea12a.jpg | imagesize = 170px | alt = | caption = Large brown crystals of beudantite | formula = PbFe<sub>3</sub>(OH)<sub>6</sub>SO<sub>4</sub>AsO<sub>4</sub> | IMAsymbol=Bdn<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|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 = | strunz = 8.BL.10 | dana = 43.4.1.1 | system = Trigonal | class = Hexagonal scalenohedral ({{overline|3}}m) <br/>H-M symbol: ({{overline|3}} 2/m) | symmetry = ''R''{{overline|3}}m | unit cell = a = 7.32 Å, c = 17.02 Å; Z = 3 | color = black, dark green, brown, yellowish, red, greenish yellow, brown | habit = tabular, acute rhombohedral, pseudo-cubic, pseudo-cuboctahedral | twinning = | cleavage = distinct; good on {0001} | fracture = | tenacity = | mohs = 3.5–4.5 | luster = vitreous, resinous | refractive = n<sub>ω</sub> = 1.957 n<sub>ε</sub> = 1.943 | opticalprop = Uniaxial (−) | birefringence = δ = 0.014 | pleochroism = visible | 2V = | dispersion = | streak = grayish yellow to green | gravity = 4.48 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = transparent, translucent | other = Soluble in HCl |references = <ref name=Mindat>[http://www.mindat.org/min-652.html Mindat.org]</ref><ref>[http://webmineral.com/data/Beudantite.shtml Web Mineral data]</ref><ref name=Handbook>[http://rruff.geo.arizona.edu/doclib/hom/beudantite.pdf Handbook of Mineralogy]</ref> }}
'''Beudandite''' is a secondary mineral occurring in the oxidized zones of polymetallic deposits.<ref name=Handbook/> It is a lead, iron, arsenate, sulfate with endmember formula: PbFe<sub>3</sub>(OH)<sub>6</sub>SO<sub>4</sub>AsO<sub>4</sub>.
Beudantite is in a subgroup of the alunite group. It is the arsenate analogue of the phosphate corkite. Beudantite also forms a solid-solution with segnitite and plumbojarosite.<ref name=Mindat/>
It crystallizes in the trigonal crystal system and shows a variety of crystal habits including tabular, acute rhombohedral, pseudo-cubic and pseudo-cuboctahedral.
It occurs in association with carminite, scorodite, mimetite, dussertite, arseniosiderite, pharmacosiderite, olivenite, bayldonite, duftite, anglesite, cerussite and azurite.<ref name=Handbook/>
== Discovery == Beudantite was first described in 1826 for an occurrence in the Louise Mine, Wied Iron Spar District, Westerwald, Rhineland-Palatinate, Germany. It was named by Armand Lévy after his fellow Frenchman and mineralogist François Sulpice Beudant (1787–1850).<ref name=Mindat/>
==See also== *List of minerals *List of minerals named after people
== References == {{commons category| Beudantite}} {{reflist}}
Category:Sulfate minerals Category:Arsenate minerals Category:Iron minerals Category:Lead minerals Category:Trigonal minerals Category:Minerals in space group 166 Category:Beudantite group