# Banalsite

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> Source: https://en.wikipedia.org/wiki/Banalsite
> Source revision: 1339788946
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{{Short description|Rare barium feldspar mineral}}
{{infobox mineral
| name        = Banalsite
| category = [Tectosilicate](/source/Tectosilicate) minerals
| group = [Feldspar](/source/Feldspar) group
| image       =Banalsite.jpg 
| alt         = 
| caption     = Banalsite from Sweden (brown) on matrix
| boxbgcolor  = #231709
| boxtextcolor = white
| formula     = BaNa<sub>2</sub>Al<sub>4</sub>Si<sub>4</sub>O<sub>16</sub>
|IMAsymbol=Bns<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>
| IMAstatus   = Grandfathered (1944)
| molweight   = 
| strunz      = 9.FA.60
| dana        = 76.1.6.1
| system      = [Orthorhombic](/source/Orthorhombic)
| class       = [Rhombic pyramidal](/source/Rhombic_pyramidal) (mm2)
| symmetry    = [Iba2](/source/Iba2) (no. 45)
| unit cell   = a = 8.496(2)&nbsp;[Å](/source/%C3%85ngstrom), <br/>b = 9.983(2)&nbsp;Å, <br/>c = 16.755(3)&nbsp;Å; Z&nbsp;=&nbsp;4
| color       = White, brown
| colour      = 
| habit       = Rarely showing traces of crystal faces; coarsely crystalline to compact, massive
| twinning    = 
| cleavage    = Good on {110} and {001}
| fracture    = 
| tenacity    =
| mohs        = 6.5
| luster      = Vitreous, pearly on cleavage
| streak      = White
| diaphaneity = Translucent to transparent
| gravity     = 3.065
| density     = 
| polish      = 
| opticalprop = Biaxial (+)
| refractive  = n<sub>α</sub> = 1.570 n<sub>β</sub> = 1.571 n<sub>γ</sub> = 1.578
| birefringence = 
| pleochroism = 
| 2V          = Measured: 41°, Calculated: 52°
| dispersion  = 
| extinction  = 
| length fast/slow =
| fluorescence= 
| absorption  =
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| other       = 
| alteration  = 
| references  = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Banalsite Mineralienatlas]</ref><ref name=Handbook>http://rruff.geo.arizona.edu/doclib/hom/banalsite.pdf Handbook of Mineralogy</ref><ref name=Mindat>http://www.mindat.org/min-504.html Mindat.org</ref><ref name=Webmin>http://www.webmineral.com/data/Banalsite.shtml Webmineral data</ref>
}}
'''Banalsite''' is a rare [barium](/source/barium), [sodium](/source/sodium) [aluminium](/source/aluminium) [silicate mineral](/source/silicate_mineral) with formula: BaNa<sub>2</sub>Al<sub>4</sub>Si<sub>4</sub>O<sub>16</sub>. Banalsite is a [tectosilicate](/source/tectosilicate) of the [feldspar](/source/feldspar) group.

Banalsite and its [strontium](/source/strontium) analogue, [stronalsite](/source/stronalsite) (SrNa<sub>2</sub>Al<sub>4</sub>Si<sub>4</sub>O<sub>16</sub>), constitute a complete [solid solution](/source/solid_solution) series.<ref>[http://rruff.info/uploads/CM44_533.pdf Liferovich, Ruslan P., et al., ''The Crystal Structure of Stronalsite and a Redetermination of the Structure of Banalsite,'' The Canadian Mineralogist, Vol. 44, pp. 533-546 (2006)]</ref> In addition limited solid solution with [calcium](/source/calcium) exists between these and [lisetite](/source/lisetite): CaNa<sub>2</sub>Al<sub>4</sub>Si<sub>4</sub>O<sub>16</sub>.<ref name=Liferovich2>[http://rruff.info/uploads/CM44_929.pdf Liferovich, Ruslan P., et al., ''Paragenesis and Composition of Banalsite, Stronalsite, and Their Solid Solution in Nepheline Syenite and Ultramafic Alkaline Rocks,'' The Canadian Mineralogist, Vol. 44, pp. 929-942 (2006)]</ref>

It was first described in 1944 for an occurrence in the Benallt Mine, Rhiw, Llanfaelrhys, [Lleyn Peninsula](/source/Lleyn_Peninsula), [Gwynedd](/source/Gwynedd) (Caernarvonshire), [Wales](/source/Wales).<ref name=Mindat/> The name is derived from the chemical symbols of its composition. It has also been reported from [Långban](/source/L%C3%A5ngban), [Värmland](/source/V%C3%A4rmland), [Sweden](/source/Sweden) and from the [Kalahari](/source/Kalahari) manganese field, [Cape Province](/source/Cape_Province), [South Africa](/source/South_Africa).<ref name=Handbook/> It has recently been reported from the [nepheline syenite](/source/nepheline_syenite)s of the [Zhidoy massif](/source/Zhidoy_massif), Eastern Sayan, [Siberia](/source/Siberia), Russia; the [Prairie Lake](/source/Prairie_Lake_carbonatite) complex of alkaline rocks and [carbonatite](/source/carbonatite)s, Superior Alkaline Province, northwestern [Ontario](/source/Ontario), [Canada](/source/Canada); the [Pilansberg](/source/Pilansberg) peralkaline complex, [South Africa](/source/South_Africa); the Sakharjok alkaline complex in the [Kola Alkaline Province](/source/Kola_Alkaline_Province), [Kola Peninsula](/source/Kola_Peninsula) of northwestern Russia (the Gremyakha–Vyrmes peralkaline complex, and the Turiy Mys complex of ultramafic–alkaline rocks and carbonatites).<ref name=Liferovich2/>

==References==
{{Reflist}}

Category:Feldspar group
Category:Orthorhombic minerals
Category:Minerals in space group 45
Category:Barium minerals
Category:Sodium minerals
Category:Aluminium minerals
Category:Aluminosilicates

{{silicate-mineral-stub}}

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