{{Short description|Rare zinc arsenate mineral}} {{Infobox mineral | name = Legrandite | category = Arsenate minerals | boxwidth = | boxbgcolor = | image = Legrandite, limonite 1100.1.2839.jpg | imagesize = 260px | caption = | formula = Zn<sub>2</sub>(AsO<sub>4</sub>)(OH)·(H<sub>2</sub>O) | IMAsymbol = Leg<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 = 8.DC.10 | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''P2''<sub>1</sub>/c | unit cell = a = 12.805(2), b = 7.933(1) <br/>c = 10.215(2)&nbsp;[Å]; β = 104.23°; Z&nbsp;=&nbsp;8 | color = Bright yellow, wax-yellow, colorless | habit = Crystalline, prismatic, typically in sprays or sheaflike aggregates | twinning = | cleavage = Imperfect, poor one {100} | fracture = Conchoidal | tenacity = Brittle | mohs = 4.5–5 | luster = Vitreous | refractive = n<sub>α</sub> = 1.675 – 1.702 n<sub>β</sub> = 1.690 – 1.709 n<sub>γ</sub> = 1.735 – 1.740 | opticalprop = Biaxial (+) | birefringence = δ = 0.060 | pleochroism = X = Y = Colorless to yellow Z = Yellow | 2V = Measured: 50° | streak = White | gravity = 3.98–4.01 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = | references = <ref name=Handbook>[http://rruff.geo.arizona.edu/doclib/hom/legrandite.pdf Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-2365.html Mindat.org]</ref><ref name=Webmin>[http://webmineral.com/data/Legrandite.shtml Webmineral]</ref> }}

'''Legrandite''' is a rare zinc arsenate mineral, Zn<sub>2</sub>(AsO<sub>4</sub>)(OH)·(H<sub>2</sub>O).

It is an uncommon secondary mineral in the oxidized zone of arsenic bearing zinc deposits and occurs rarely in granite pegmatite. Associated minerals include: adamite, paradamite, köttigite, scorodite, smithsonite, leiteite, renierite, pharmacosiderite, aurichalcite, siderite, goethite and pyrite.<ref name=Handbook/><ref name=Mindat/> It has been reported from Tsumeb, Namibia; the Ojuela mine in Durango, Mexico and at Sterling Hill, New Jersey, US.<ref name=Handbook/>

It was first described in 1934 for an occurrence in the Flor de Peña Mine, Nuevo León, Mexico and named after Louis C.A. Legrand, a Belgian mining engineer.<ref name=Mindat/>

==References== {{Reflist}}

{{Commons category|Legrandite|position=left}}

Category:Zinc minerals Category:Arsenate minerals Category:Monoclinic minerals Category:Minerals in space group 14 Category:Minerals described in 1934

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