{{Short description|Phosphate mineral}} {{Infobox mineral | name = Corkite | category = Phosphate minerals | boxwidth = 24 | boxbgcolor = | image = Corkite-Goethite.jpg | caption = Corkite on a goethite matrix | formula = PbFe<sub>3</sub>[(OH)<sub>6</sub>:SO<sub>4</sub>:PO<sub>4</sub>] | IMAsymbol = Cok<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 = 667.82 g/mol | strunz = 8.BL.05 | dana = 43.4.1.2 | system = Trigonal | class = Ditrigonal pyramidal (3/m) <br/><small>(same H-M symbol)</small> | symmetry = ''R3m'' | unit cell = a = 7.3065(5)&nbsp;Å, <br/>c = 16.897(2)&nbsp;Å; <br/>V = 781.2&nbsp;ų; Z&nbsp;=&nbsp;3 | color = Brown to light yellowish brown, pale yellow, yellowish green to dark green | habit = Crystals pseudocubic rhombohedral with prominent {10{{overline|1}}1}. Commonly in crusts and massive | lattice = | twinning = | cleavage = Perfect on {0001} | fracture = | tenacity = | mohs = 3.5–4.5 | luster = Vitreous, resinous | refractive = ''n''<sub>ω</sub> = 1.930 ''n''<sub>ε</sub> = 1.930 ''n'' = 1.93 – 1.96 | opticalprop = Uniaxial (−), may appear anomalously biaxial | birefringence = δ = 0.000 | pleochroism = | 2V = | dispersion = | streak = | gravity = 4.295 (measured), 4.31 (calculated) | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = transparent | other = Readily soluble in warm HCl |references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Corkite Mineralienatlas]</ref><ref name=Mindat>Mindat.org http://www.mindat.org/min-1130.html</ref><ref>Webmineral.com http://webmineral.com/data/Corkite.shtml</ref><ref>EuroMin.net http://euromin.w3sites.net//mineraux/CORKITE.html</ref><ref name=Handbook>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/corkite.pdf |title=Handbook of Mineralogy |access-date=2010-07-30 |archive-date=2011-07-28 |archive-url=https://web.archive.org/web/20110728180705/http://www.handbookofmineralogy.com/pdfs/corkite.pdf |url-status=dead }}</ref> }}

'''Corkite''' is a phosphate mineral in the beudantite subgroup of the alunite group. Corkite is the phosphate analogue of beudantite and with it, a complete solid solution range exists. Corkite will also form a solid solution with kintoreite.

Corkite is named after County Cork, Ireland; the location where the first notable amount was discovered in 1869.<ref name=Mindat/> Like many of the other minerals in the beudantite group, corkite is a relatively uncommon, secondary mineral that occurs in oxidation zones near hydrothermal base metal deposits.<ref name=Mindat/> It occurs associated with pyromorphite, malachite, plumbojarosite, limonite and quartz.<ref name=Handbook/>

== References == {{Reflist}}

Category:Phosphate minerals Category:Sulfate minerals Category:Lead minerals Category:Iron minerals Category:Trigonal minerals Category:Minerals in space group 160 Category:Beudantite group

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