{{Infobox mineral | name = Fluckite | category = Arsenate minerals | boxwidth = | boxbgcolor = | image = Fluckite (Sainte-Marie-aux-Mines)-Musée de minéralogie de Strasbourg.jpg | imagesize = 260px | caption = Fluckite from the Gabe-Gottes Mine | formula = CaMnH<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>·2(H<sub>2</sub>O) <ref name=mindat/> | IMAsymbol = Fck<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.CB.15 | system = Triclinic | class = Pinacoidal ({{overline|1}}) <br/><small>(same H-M symbol)</small> | symmetry = ''P''{{overline|1}} | unit cell = a = 8.459, b = 7.613 <br/>c = 6.968 [Å]; α = 82.21° <br/>β = 98.25°, γ = 95.86°; Z = 2 | color = Colorless, Light to Dark Pink | habit = Crystals prismatic, typically radiating to spherulitic | twinning = | cleavage = (010) perfect, (100) good, (101) indistinct | fracture = | tenacity = | mohs = 3.5-4 | luster = Subvitreous, waxy | refractive = n<sub>α</sub> = 1.618 n<sub>β</sub> = 1.627 n<sub>γ</sub>= 1.642 | opticalprop = Biaxial (+), probable | 2V = Large | birefringence = 0.024 | pleochroism = | streak = White | gravity = 3.05 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent | other = | references = <ref name=mindat>[http://www.mindat.org/min-1564.html Fluckite: mindat.org]</ref><ref name=webmineral>[http://www.webmineral.com/data/Fluckite.shtml Fluckite: webmineral.com]</ref><ref>{{usurped|1=[https://web.archive.org/web/20080829234331/http://www.mineralatlas.com/mineral%20general%20descriptions/F/fluckitepcd.htm Fluckite: Mineral Atlas]}}</ref><ref name=HBM>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/fluckite.pdf |title=Fluckite: Handbook of Mineralogy |access-date=2010-10-01 |archive-date=2012-07-15 |archive-url=https://web.archive.org/web/20120715123807/http://www.handbookofmineralogy.com/pdfs/fluckite.pdf |url-status=dead }}</ref> }} '''Fluckite''' is an arsenate mineral with the chemical formula CaMnH<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>·2(H<sub>2</sub>O).<ref name=mindat/>
Fluckite's mineral crystallography is triclinic meaning it has three axis of different length and three different interior angles that do not equal 90°. Because fluckite possesses three axes with different angles and lengths it is an anisotropic mineral. This means that it has more than one optic axis. This mineral is a member of the P{{overline|1}} space group meaning that it can be rotated 360° degrees and inverted to obtain the original figure. Optically, this mineral has positive biaxial birefringence, which can be shown obtaining an interference figure that is blue in the upper right and lower left quadrants of the figure while looking down the c- axis. Fluckite possesses moderate optical relief which is the degree to which the mineral stands out from the mounting medium.<ref name=mindat/>
==Occurrence== Fluckite was first described in 1980 for an occurrence in the Gabe-Gottes Mine in Haut-Rhin, Alsace, France,<ref name=mindat/><ref name=Fleischer>M. Fleischer, L.J. Cabri, G.Y. Chao, and A. Pabst (1980) New Mineral Names*, American Mineralogist, 65,1065-1070.</ref> and named for mineralogist Pierre Fluck of Louis Pasteur University in Strasbourg, France.<ref name=webmineral /> The mineral was found in at a depth of {{convert|100|m|abbr=on}}. It occurs as a post-mine phase on carbonate gangue.<ref name=Fleischer/> It occurs in association with native arsenic, tennantite, skutterudite, sainfeldite, pharmacolite, villyaellenite, picropharmacolite, calcite, dolomite, ankerite and quartz.<ref name=HBM/>
==References== {{Reflist}}
Category:Arsenate minerals Category:Calcium minerals Category:Manganese(II) minerals Category:Triclinic minerals Category:Minerals in space group 2