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Långban, Filipstad, Värmland, Sweden
© Knut Eldjarn
|Name:||The name is derived from the chemical symbols of the elements in its composition: barium (Ba), sodium (Na), Aluminum (Al) and silicon (Si).|
Forms a solid-solution series with stronalsite
Classification of Banalsite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/J.07-100|
|Nickel-Strunz 10th (pending) edition ID:||9.FA.60|
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
|Dana 8th edition ID:||22.214.171.124|
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
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Type Occurrence of Banalsite
|Type Locality:||Benallt Mine (Tyddyn Meirion mine; Ty Canol mine), Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales, UK|
|Year of Discovery:||1944|
Physical Properties of Banalsite
Crystallography of Banalsite
|Cell Parameters:||a = 8.49Å, b = 9.98Å, c = 16.75Å|
|Ratio:||a:b:c = 0.851 : 1 : 1.678|
|Unit Cell Volume:||V 1,419.23 Å³ (Calculated from Unit Cell)|
Optical Data of Banalsite
|RI values:||nα = 1.570 nβ = 1.571 nγ = 1.578|
|2V:||Measured: 41° , Calculated: 52°|
|Maximum Birefringence:||δ = 0.008|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v|
Chemical Properties of Banalsite
|Simplified for copy/paste:||BaNa2[Al2Si2O8]2|
|Essential elements:||Al, Ba, Na, O, Si|
|All elements listed in formula:||Al, Ba, Na, O, Si|
Relationship of Banalsite to other Species
|Series:||Forms a series with Stronalsite (see here)|
|Member of:||Feldspar Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Banalsite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Banalsite
American Mineralogist: 30: 85.
Mineralogical Journal: 7: 262-281.
Internet Links for Banalsite
Localities for Banalsite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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