{{Short description|Arsenite mineral}} {{infobox mineral | name = Weilite | image = Weilite.jpg | imagesize = | alt = | caption = Weilite (white) with pink erythrite from Richelsdorf District, Wildeck, Hesse, Germany | category = Arsenate mineral | formula = CaHAsO<sub>4</sub> | IMAsymbol = Wei<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 = | strunz = 8.AD.10 | dana = | system = Triclinic | class = Pinacoidal ({{overline|1}}) <br/><small>(same H-M symbol)</small> | symmetry = ''P''{{overline|1}} | unit cell = a = 7.059 Å, b = 6.891 Å <br/>c = 7.201 Å; α = 97.43° <br/>β = 103.55°, γ = 87.75°; Z = 4 | color = White | colour = | habit = Powdery, massive | twinning = | cleavage = | fracture = Irregular/uneven | tenacity = Brittle | mohs = | luster = Waxy, greasy, dull | streak = White | diaphaneity = Translucent | gravity = 3.48 | density = | polish = | opticalprop = Biaxial (-) | refractive = n<sub>α</sub> = 1.644 n<sub>γ</sub> = 1.688 | birefringence = δ = 0.044 | pleochroism = | 2V = Measured: 81° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref name=Mindat>[http://www.mindat.org/min-4259.html Mindat.org]</ref><ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/weilite.pdf Handbook of Mineralogy]</ref><ref name=Webmin>[http://www.webmineral.com/data/Weilite.shtml Webmineral data]</ref> }} '''Weilite''' (CaHAsO<sub>4</sub>) is a rare arsenate mineral. It is a translucent white triclinic mineral with a waxy luster.<ref name=Mindat/>
It was first described in 1963 for occurrences in Gabe Gottes Mine, Haut-Rhin, Alsace, France; Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany; and the Schneeberg District, Erzgebirge, Saxony, Germany. It is named after French mineralogist René Weil of the University of Strasbourg.<ref name=Mindat/> It occurs in the oxidized zone of arsenic-bearing hydrothermal veins. It occurs as an alteration product of pharmacolite and haidingerite.<ref name=HBM/><ref name=Webmin/>
== References == {{Reflist}}
Category:Arsenate minerals Category:Calcium minerals Category:Triclinic minerals Category:Minerals in space group 2 Category:Minerals described in 1963
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