{{Short description|Arsenate mineral}} {{Infobox mineral|boxbgcolor=#aaaaaa|name=Mansfieldite|image=Mansfieldite.jpg|formula=AlAsO<sub>4</sub>·2H<sub>2</sub>O| IMAsymbol = Mfd<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=08.CD.10|system=Orthorhombic|dana=40.04.01.04|class=Orthorhombic-Dipyramidal (''mmm'') <br/>H-M symbol: (2/''m'' 2/''m'' 2/''m'')|symmetry=''Pbca''|unit cell=876.8 ų|molweight=201.93 gm|color=White, light gray|habit=Spherical, encrustations|cleavage=Indistinct on {201} and on {001} and {100} in traces|fracture=Sub-conchoidal|mohs=3.5–4|luster=Vitreous|opticalprop=Biaxial (+)|refractive=n<sub>α</sub> = 1.622 – 1.631 n<sub>β</sub> = 1.624 – 1.649 n<sub>γ</sub> = 1.642 – 1.663|birefringence=0.020 – 0.032|2V=Measured 30°–68°, calculated 38°–82°|dispersion=None|streak=White|gravity=3.03|density=3.03|diaphaneity=Transparent, transculent|impurities=Cobalt}}
'''Mansfieldite''' is an uncommon mineral that was named after an American geologist, George Rogers Mansfield. It has been considered a valid species since 1948. It is a member of the variscite group. Mansfieldite creates a series with scorodite, and it is the aluminium analogue of said gem. Mansfieldite is colorless in transmitted light.<ref>{{Cite web|title=Mansfieldite|url=https://www.mindat.org/min-2568.html|access-date=2021-06-22|website=www.mindat.org}}</ref> It is mostly made out of oxygen (47.54%). Other components include arsenic (37.1%), aluminium (13.36%) and hydrogen (2%).<ref>{{Cite web|title=Mansfieldite Mineral Data|url=http://webmineral.com/data/Mansfieldite.shtml|access-date=2021-06-22|website=webmineral.com}}</ref> Mansfieldite crystals form due to hydrothermal origin in altered and mineralized andesitic pyroclastic rocks. Due to its size, mansfieldite is hard to see even under a microscope. The pink variation of the mineral is due to cobalt impurities, otherwise it is white to light gray. It can be found in the US, Mexico, France, Algeria, England, Australia, Germany, Algeria and Kazakhstan.<ref>{{Cite web|last=Minerals|first=Dakota Matrix|title=Mansfieldite mineral information and data|url=https://www.dakotamatrix.com/mineralpedia/7291/mansfieldite|access-date=2021-06-22|website=www.dakotamatrix.com|language=en}}</ref>
== References == <references />
Category:Arsenate minerals Category:Orthorhombic minerals Category:Aluminium minerals Category:Dihydrate minerals Category:Minerals described in 1948