# Fluckite

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> Source: https://en.wikipedia.org/wiki/Fluckite
> Source revision: 1318409398
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{{Infobox mineral
| name        = Fluckite
| category    = [Arsenate minerals](/source/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](/source/Triclinic)
| class       = Pinacoidal ({{overline|1}}) <br/><small>(same [H-M symbol](/source/H-M_symbol))</small>
| symmetry    = ''P''{{overline|1}}
| unit cell   = a = 8.459, b = 7.613 <br/>c = 6.968&nbsp;[Å]; α = 82.21° <br/>β = 98.25°, γ = 95.86°; Z&nbsp;=&nbsp;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](/source/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](/source/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](/source/birefringence), which can be shown obtaining an [interference figure](/source/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](/source/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](/source/Haut-Rhin), [Alsace](/source/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](/source/mineralogist) Pierre Fluck of [Louis Pasteur University](/source/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](/source/Carbonate_mineral) [gangue](/source/gangue).<ref name=Fleischer/> It occurs in association with native arsenic, [tennantite](/source/tennantite), [skutterudite](/source/skutterudite), [sainfeldite](/source/sainfeldite), [pharmacolite](/source/pharmacolite), [villyaellenite](/source/villyaellenite), [picropharmacolite](/source/picropharmacolite), [calcite](/source/calcite), [dolomite](/source/dolomite_(mineral)), [ankerite](/source/ankerite) and [quartz](/source/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

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