Felsőbányaite

{{Short description|Sulfate mineral}} {{infobox mineral | name = Felsőbányaite | image = Felsöbanyaite Soria.jpg | alt = | caption = Felsöbanyaite as white spherules. Roadcut near Sant Marti dels Castells (Lérida) Spain | category = Sulfate mineral | formula = Al4(SO4)(OH)10·4H2O | IMAsymbol = Fsb<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> | strunz = 7.DD.05 | dana = | system = Monoclinic | class = Sphenoidal (2) (same H-M symbol) | symmetry = ''P2''1 | unit cell = a = 13.026 Å, b = 10.015 Å, c = 11.115 Å; β = 104.34°; Z = 4 | color = White to pale yellow, pale brown | habit = Globular masses, minute rhombic crystals | twinning = | cleavage = Distinct to good on {010} and {100} | fracture = | tenacity = | mohs = 1.5 | luster = Vitreous, pearly on cleavage surfaces | streak = | diaphaneity = Semitransparent | gravity = 2.33 | density = | polish = | opticalprop = Biaxial (+) | refractive = n = 1.515–1.540 | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref name=Mindat>[http://www.mindat.org/min-1474.html Felsőbányaite on Mindat.org]</ref><ref name=HBM>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/basaluminite.pdf |title=Basaluminite in the ''Handbook of Mineralogy'' |access-date=2014-07-29 |archive-date=2015-09-24 |archive-url=https://web.archive.org/web/20150924043655/http://www.handbookofmineralogy.com/pdfs/basaluminite.pdf |url-status=dead }}</ref> }} '''Felsőbányaite''' or '''basaluminite''' is a hydrated aluminium sulfate mineral with formula: Al4(SO4)(OH)10·4H2O. It is a rare white to pale yellow mineral which typically occurs as globular masses and incrustations or as minute rhombic crystals. It crystallizes in the monoclinic crystal system.<ref name=HBM/><ref name=Mindat/>

It occurs as a weathering product under acidic conditions associated with pyrite or marcasite decomposition. Associated minerals include hydrobasaluminite, hydroargillite, meta-aluminite, allophane, gibbsite, gypsum and aragonite.<ref name=HBM/>

Felsőbányaite was first described in 1853 for an occurrence in the Baia Sprie mine, Baia Sprie (''Felsőbánya''), Maramureș County, Romania, and named for the locality.<ref name=Mindat/> The mineral name ''basaluminite'' was used for an occurrence of the same mineral in England in 1948 and discredited by the International Mineralogical Association (IMA) in 2006.<ref>{{Cite web |url=http://pubsites.uws.edu.au/ima-cnmnc/GQNminerals.pdf |title=Burke, E. A. (2006) ''A mass discreditation of GQN minerals,'' The Canadian Mineralogist, 44(6), pp. 1557-1560 |access-date=2014-07-29 |archive-date=2012-03-26 |archive-url=https://web.archive.org/web/20120326091801/http://pubsites.uws.edu.au/ima-cnmnc/GQNminerals.pdf |url-status=dead }}</ref>

==References== {{Reflist}}

{{DEFAULTSORT:Felsobanyaite}} Category:Aluminium minerals Category:Sulfate minerals Category:Hydroxide minerals Category:Tetrahydrate minerals Category:Monoclinic minerals Category:Minerals in space group 4 Category:Minerals described in 1853