# Legrandite

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> Markdown URL: https://mediated.wiki/source/Legrandite.md
> Source: https://en.wikipedia.org/wiki/Legrandite
> Source revision: 1288292600
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Rare zinc arsenate mineral}}
{{Infobox mineral
| name        = Legrandite
| category    = [Arsenate minerals](/source/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](/source/Monoclinic)
| class       = Prismatic (2/m) <br/><small>(same [H-M symbol](/source/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](/source/zinc) [arsenate mineral](/source/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](/source/oxidized) zone of arsenic bearing zinc deposits and occurs rarely in [granite](/source/granite) [pegmatite](/source/pegmatite). Associated minerals include: [adamite](/source/adamite), [paradamite](/source/paradamite), [köttigite](/source/k%C3%B6ttigite), [scorodite](/source/scorodite), [smithsonite](/source/smithsonite), [leiteite](/source/leiteite), [renierite](/source/renierite), [pharmacosiderite](/source/pharmacosiderite), [aurichalcite](/source/aurichalcite), [siderite](/source/siderite), [goethite](/source/goethite) and [pyrite](/source/pyrite).<ref name=Handbook/><ref name=Mindat/> It has been reported from [Tsumeb](/source/Tsumeb), [Namibia](/source/Namibia); the [Ojuela](/source/Ojuela) mine in [Durango](/source/Durango), Mexico and at [Sterling Hill](/source/Sterling_Hill), [New Jersey](/source/New_Jersey), US.<ref name=Handbook/>

It was first described in 1934 for an occurrence in the Flor de Peña Mine, [Nuevo León](/source/Nuevo_Le%C3%B3n), 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

{{mineral-stub}}

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