{{Short description|Aluminium halide mineral}} {{Infobox mineral | name = Cadwaladerite | category = Halide mineral | boxwidth = | boxbgcolor = | image = Cadwaladerite.jpg | imagesize = | caption = Yellow microcrystals and masses of the very rare aluminium chloride-hydroxide mineral Cadwaladerite from only one the three known localities worldwide: Maria Mine, Caleta Vítor District, Arica & Parinacota Region, Chile. | formula = {{chem2|AlCl(OH)2*4H2O}} | IMAsymbol=Cwd<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 = 168.51 g/mol | strunz = 3.BD.05 | system = amorphous | color = Lemon yellow | habit = | twinning = | cleavage = | fracture = Conchoidal | tenacity = | mohs = | luster = Vitreous | polish = | refractive = n = 1.513, variable | opticalprop = Isotropic | birefringence = | dispersion = | pleochroism = | fluorescence= | absorption = | streak = | gravity = 1.66 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = transparent | other = deliquescent | references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Cadwaladerite Mineralienatlas]</ref><ref name=Webmin>[http://www.webmineral.com/data/Cadwaladerite.shtml Cadwaladerite Mineral Data - Webmineral]</ref><ref name=Mindat>[http://www.mindat.org/min-845.html Cadwaladerite mineral information and data - Mindat.org]</ref><ref name=HBM>[http://www.handbookofmineralogy.org/pdfs/cadwaladerite.pdf Handbook of Mineralogy]</ref> }} '''Cadwaladerite''' is a rare aluminium halide mineral with formula: AlCl(OH)<sub>2</sub>·4(H<sub>2</sub>O). It was reported for an amorphous substance associated with sulfate minerals and embedded in a halite crystal cluster. Its status is uncertain due to inadequate data.<ref name=Webmin/><ref name=Mindat/><ref name=HBM/> It was first described in 1941 for an occurrence in mine dumps of the Victoria Segunda mine Cerros Pintados, Iquique province, Tarapacá Region, Chile.<ref name=Mindat/> It was named for Charles Meigs Biddle Cadwalader, president of the Academy of Natural Sciences.<ref name=HBM/> Lesukite was discredited (IMA2018-H).
==References== {{reflist}}
Category:Aluminium minerals Category:Chloride minerals Category:Hydroxide minerals Category:Tetrahydrate minerals Category:Minerals described in 1941
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