# Cadwaladerite

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> Source: https://en.wikipedia.org/wiki/Cadwaladerite
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{{Short description|Aluminium halide mineral}}
{{Infobox mineral
| name        = Cadwaladerite
| category    = [Halide mineral](/source/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](/source/aluminium) [halide mineral](/source/halide_mineral) with formula: AlCl(OH)<sub>2</sub>·4(H<sub>2</sub>O). It was reported for an [amorphous](/source/amorphous) substance associated with [sulfate minerals](/source/Sulfate_mineral) and embedded in a [halite](/source/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](/source/Iquique_Province), [Tarapacá Region](/source/Tarapac%C3%A1_Region), [Chile](/source/Chile).<ref name=Mindat/> It was named for Charles Meigs Biddle Cadwalader, president of the [Academy of Natural Sciences](/source/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

{{halide-mineral-stub}}

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Adapted from the Wikipedia article [Cadwaladerite](https://en.wikipedia.org/wiki/Cadwaladerite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Cadwaladerite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.