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Banalsite

A valid IMA mineral species - grandfathered
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02854990017089087044126.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
06994740014977294246650.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
08970810015142465514434.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
05102100017058434717859.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
06568900014948593032176.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
02401890014948593046285.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
05102100017058434717859.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
06994740014977294246650.jpg
Banalsite

Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
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About BanalsiteHide

Formula:
Na2BaAl4Si4O16
Colour:
White
Lustre:
Pearly
Hardness:
6
Specific Gravity:
3.05 (Calculated)
Crystal System:
Orthorhombic
Member of:
Feldspar Group
Name:
The name is derived from the chemical symbols of the elements in its composition: barium (Ba), sodium (Na), Aluminum (Al) and silicon (Si).
Feldspar Group.

Forms a solid-solution series with stronalsite.




Unique IdentifiersHide

Mindat ID:
504
Long-form identifier:
mindat:1:1:504:7
GUID
(UUID V4):
9cb62f6a-b027-4c49-ada3-6f9569f1ab49

IMA Classification of BanalsiteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1944
Type description reference:
Smith W C, Bannister F A, Hey M H, Groves A W (1944) Banalsite, a new barium-feldspar from Wales. Mineralogical Magazine 27, 33-47

Classification of BanalsiteHide

Strunz-mindat (2024):
9.FA.60

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
Dana 8th ed.:
76.1.6.1

76 : TECTOSILICATES Al-Si Framework
1 : Al-Si Framework with Al-Si frameworks
Hey's CIM Ref.:
16.12.8

16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
BnsIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
BnsThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of BanalsiteHide

Lustre:
Pearly
Transparency:
Transparent, Translucent
Comment:
Cleavages show a good pearly lustre
Colour:
White
Streak:
White
Hardness:
6 on Mohs scale
Cleavage:
Distinct/Good
(110) and (001).
Density:
3.05 g/cm3 (Calculated)

Optical Data of BanalsiteHide

Type:
Biaxial (+)
RI values:
nα = 1.570(5) nβ = 1.571(5) nγ = 1.578(5)
2V:
Measured: 41° , Calculated: 52°
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v

Chemistry of BanalsiteHide

Mindat Formula:
Na2BaAl4Si4O16
Elements listed:
Al, Ba, Na, O, Si - search for minerals with similar chemistry
Common Impurities:
Mn,Mg,Ca,K

Crystallography of BanalsiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Iba2
Cell Parameters:
a = 8.5400(7) Å, b = 10.0127(5) Å, c = 16.7897(14) Å
Ratio:
a:b:c = 0.853 : 1 : 1.677
Unit Cell V:
1,435.66 ų (Calculated from Unit Cell)
Twinning:
none
Comment:
Benallt

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006094BanalsiteLiferovich R P, Locock A J, Mitchell R H, Shpachenko A K (2006) The crystal structure of stronalsite and a redetermination of the structure of banalsite The Canadian Mineralogist 44 533-5462006Benallt mine, Wales0293
0006095BanalsiteLiferovich R P, Locock A J, Mitchell R H, Shpachenko A K (2006) The crystal structure of stronalsite and a redetermination of the structure of banalsite The Canadian Mineralogist 44 533-5462006Langban, Sweden0293
0010759BanalsiteTakeuchi Y, Kudoh Y, Haga N (1973) The interpretation of partial Patterson functions and its application to structure analyses of serandite Mn2NaHSi3O9 and banalsite BaNa2Al4Si4O16 Zeitschrift fur Kristallographie 138 313-33619730293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.53 Å(100)
5.20 Å(90)
8.50 Å(80)
3.21 Å(80)
2.90 Å(80)
2.09 Å(80)
3.77 Å(70)
Comments:
Benallt mine, Wales.

Geological EnvironmentHide

Type Occurrence of BanalsiteHide

Type Locality:
ⓘ Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK
Place of Conservation of Type Material:
National School of Mines, Paris, France.
The Natural History Museum, London, England, 1944,420-423.
Harvard University, Cambridge, Massachusetts, USA 108656.
National Museum of Natural History, Washington, D.C., USA, 105854.
Associated Minerals at Type Locality:
TephroiteBaryteAlleghanyite
Reference:
Smith W C, Bannister F A, Hey M H, Groves A W (1944) Banalsite, a new barium-feldspar from Wales. Mineralogical Magazine 27, 33-47

Synonyms of BanalsiteHide

Ba Feldspar (in part)

Other Language Names for BanalsiteHide

German:Banalsit
Spanish:Banalsita

Relationship of Banalsite to other SpeciesHide

Member of:
Feldspar Group
Other Members of this group:
Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Buddingtonite(NH4)(AlSi3O8)Mon. 2 : P21
CelsianBa(Al2Si2O8)Mon. 2/m
CleavelanditeNa(AlSi3O8)Tric.
FilatoviteK(Al,Zn)2(As,Si)2O8Mon. 2/m
HexacelsianBaAl2Si2O8Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
KokchetaviteK(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
ParacelsianBa(Al2Si2O8)Mon. 2/m : P21/b
Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
ReedmergneriteNaBSi3O8Tric. 1 : P1
SlawsoniteSr(Al2Si2O8)Mon. 2/m : P21/b
StronalsiteNa2SrAl4Si4O16Orth.
SvyatoslaviteCa(Al2Si2O8)Mon. 2 : P21
Unnamed (New Ordered Member of the Alkali Feldspar Series)KNa(Si6Al2)O16Mon. m
Forms a series with:
StronalsiteBanalsite-Stronalsite Series

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Banalsite associated with StronalsiteNa2SrAl4Si4O16
2 photos of Banalsite associated with NatroliteNa2Al2Si3O10 · 2H2O
2 photos of Banalsite associated with AlbiteNa(AlSi3O8)
2 photos of Banalsite associated with ChromojadeiteNa(Al,Cr)Si2O6
2 photos of Banalsite associated with CelsianBa(Al2Si2O8)
2 photos of Banalsite associated with CymriteBaAl2Si2(O,OH)8 · H2O
2 photos of Banalsite associated with MelanotekitePb2Fe3+2(Si2O7)O2
2 photos of Banalsite associated with FabrièsiteNa3Al3Si3O12 · 2H2O
2 photos of Banalsite associated with TrinephelineNaAlSiO4
2 photos of Banalsite associated with NephelineNa3K(Al4Si4O16)

Related Minerals - Strunz-mindat GroupingHide

9.FA.HexacelsianBaAl2Si2O8Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
9.FA.Wodegongjieite KCa3(Al7Si9)O32Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.FA.05KaliophiliteKAlSiO4Trig. 3 : P3
9.FA.05KalsiliteKAlSiO4Hex. 6 2 2 : P63 2 2
9.FA.05NephelineNa3K(Al4Si4O16)Hex. 6 : P63
9.FA.05Panunzite(K,Na)AlSiO4Hex. 6 : P63
9.FA.05TrikalsiliteK2NaAl3(SiO4)3Hex. 6 : P63
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
9.FA.05CarnegieiteNaAlSiO4Tric.
9.FA.05 vaGermanate-nepheline(Na,K)AlGeO4
9.FA.05MegakalsiliteKAlSiO4Hex. 6 : P63
9.FA.05TrinephelineNaAlSiO4 Hex. 6 : P61
9.FA.05Davidsmithite(Ca,◻)2Na6Al8Si8O32Hex. 6 : P63
9.FA.10MalinkoiteNaBSiO4Hex. 6 : P63
9.FA.15VirgiliteLiAlSi2O6Hex. 6 2 2 : P62 2 2
9.FA.25LisitsyniteKBSi2O6Orth. 2 2 2 : P2 2 2
9.FA.30Buddingtonite(NH4)(AlSi3O8)Mon. 2 : P21
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
9.FA.30MicroclineK(AlSi3O8)Tric. 1
9.FA.30OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30SanidineK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30RubiclineRb(AlSi3O8)Mon. 2/m : B2/m
9.FA.30 vaGermanate-celsianBaAl2Ge2O8
9.FA.30MonalbiteNaAlSi3O8Mon. 2/m : B2/m
9.FA.30FerrisanidineK[Fe3+Si3O8]Mon. 2/m : B2/m
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.35ReedmergneriteNaBSi3O8Tric. 1 : P1
9.FA.40ParacelsianBa(Al2Si2O8)Mon. 2/m : P21/b
9.FA.45SvyatoslaviteCa(Al2Si2O8)Mon. 2 : P21
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
9.FA.50SlawsoniteSr(Al2Si2O8)Mon. 2/m : P21/b
9.FA.55LisetiteCaNa2Al4Si4O16Orth. mm2
9.FA.60StronalsiteNa2SrAl4Si4O16Orth.
9.FA.65DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
9.FA.65MaleeviteBaB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
9.FA.65PekoviteSrB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
9.FA.70StöffleriteCaAl2Si2O8Tet. 4/m : I4/m
9.FA.70Lingunite(Na,Ca)AlSi3O8Tet. 4/m : I4/m
9.FA.70LiebermanniteKAlSi3O8Tet. 4/m : I4/m
9.FA.75KokchetaviteK(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc

Other InformationHide

Notes:
The mineral is decomposed by HCl, leaving a colourless residue.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for BanalsiteHide

References for BanalsiteHide

Localities for BanalsiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Canada
 
  • British Columbia
    • Golden Mining Division
Mark Mauthner Collection (Personally Collected) +1 other reference
  • Ontario
    • Thunder Bay District
      • Killala Lake Area
The Canadian Mineralogist Vol. 44 (2006)
Finland
 
  • Lapland
    • Ranua
Mutanen
Guatemala
 
  • Motagua Valley
Mikhail Ostrooumov and Alfredo Victoria Morales (2010)
Japan
 
  • Niigata Prefecture
Shi et al. (2012) +1 other reference
  • Tokyo Metropolis
    • Nishitama district
      • Okutama-cho
Tokyo University collection +1 other reference
Myanmar
 
  • Kachin State
    • Mohnyin District
      • Hpakant Township (Hpakan; Phakant; Phakan)
Shi et al. (2012) +1 other reference
Ferraris et al. (2014)
Norway
 
  • Troms og Finnmark
    • Karlsøy
Bøe (2000) +2 other references
Russia
 
  • Buryatia
    • Baunt District
      • Vitim Plateau
Doroshkevich et al. (2012)
  • Irkutsk Oblast
Pavel.M. Kartashov (n.d.) +1 other reference
  • Murmansk Oblast
Liferovich et al. (2006)
    • Khibiny Massif
Konopleva et al. (2008)
Konopleva et al. (2008)
Mikhailova et al. (2007)
Konopleva et al. (2008)
Konopleva et al. (2008)
    • Turii Cape
Liferovich et al. (2006)
South Africa
 
  • North West
    • Bojanala Platinum District Municipality
      • Moses Kotane Local Municipality
Mitchell et al. (2004) +1 other reference
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
        • Black Rock
South African Micromount Society et al. (1989)
South African Micromount Society et al. (1989)
Cairncross et al. (1995)
Cairncross et al. (1995)
Sweden
 
  • Örebro County
    • Hällefors
      • Grythyttan
Ulf Nyberg photo & specimen
  • Värmland County
    • Filipstad
      • Långban Ore District
Holtstam et al. (1999) +2 other references
UK (TL)
 
  • Wales
    • Gwynedd
      • Aberdaron
        • Rhiw
Smith et al. (1944) +2 other references
USA
 
  • California
    • San Benito County
      • Santa Rita Peak
Van Nostrand Reinholt Press: 362. +1 other reference
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