Banalsite Mineral Data

Banalsite Mineral Data +

General Banalsite Information

Chemical Formula:

BaNa2Al4Si4O16

Composition:

Molecular Weight = 659.57 gm

Barium 20.82 % Ba 23.25 % BaO

Sodium 6.97 % Na 9.40 % Na₂O

Aluminum 16.36 % Al 30.92 % Al₂O₃

Silicon 17.03 % Si 36.44 % SiO₂

Oxygen 38.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaNa₂Al₄Si₄O₁₆

Environment:

Found in a vein in manganese ore. May form a series with stronalsite.

IMA Status:

Valid Species (Pre-IMA) 1944

Locality:

Benalli mine, Rhiw, Lleyn Peninsula, Caernarvonshire, Wales, UK. Link to MinDat.org Location Data.

Name Origin:

Named from a contraction of the component cation symbols: Ba, Na,Al, and Si.

Synonym:

ICSD 4447

PDF 38-401

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Banalsite Crystallography

Axial Ratios:

a:b:c =0.8525:1:1.678

Cell Dimensions:

a = 8.5, b = 9.97, c = 16.73, Z = 4; V = 1,417.78 Den(Calc)= 3.09

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I bam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.07(1), 3.19(1), 3.5(1),

Crystal Structure:

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Liferovich R P , Locock A J , Mitchell R H , Shpachenko A K , The Canadian Mineralogist , 44 (2006) p.533-546, The crystal structure of stronalsite and a, redetermination of the structure of banalsite, Locality: Benallt mine, Wales

View Additional jPOWD Structure files for Banalsite
[1] [2]

Physical Properties of Banalsite

Cleavage:

[110] Good, [001] Good

Color:

White.

Density:

3.065

Diaphaniety:

Translucent to transparent

Hardness:

6 - Orthoclase

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Banalsite

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1853,KPDmeas= 0.1868,KC= 0.1874

Optical Data:

Biaxial (+), a=1.5695, b=1.571, g=1.5775, bire=0.0080, 2V(Calc)=52, 2V(Meas)=41.

Calculated Properties of Banalsite

Electron Density:

r_electron=2.92 gm/cc
note: r_Banalsite=3.07 gm/cc.

Fermion Index

Fermion Index = 0.04524
Boson Index = 0.95476

Photoelectric:

PE_Banalsite= 88.93 barns/electron
U=PE_Banalsite x r_electron= 259.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Banalsite is Not Radioactive

Banalsite Classification

Dana Class:

76.1.6.1 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.6)Banalsite group

76.1.6.1 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m

76.1.6.2 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho

76.1.6.3 Lisetite Na2CaAl4Si4O16 Pbc2 mm2

76.1.6.4 Svyatoslavite CaAl2Si2O8 P 2₁ 2

Strunz Class:

VIII/J.07-100 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series

VIII/J.07-10 Anorthoclase (Na,K)AlSi3O8 C1 1

VIII/J.07-20 Albite NaAlSi3O8 C1 1

VIII/J.07-30 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-40 Andesine* (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-50 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-60 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-70 Anorthite CaAl2Si2O8 P1,I1 1

VIII/J.07-75 Dmisteinbergite CaAl2Si2O8 P 6/mmm 6/m 2/m 2/m

VIII/J.07-80 Svyatoslavite CaAl2Si2O8 P 2₁ 2

VIII/J.07-90 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho

VIII/J.07-100 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m

VIII/J.07-110 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m

Other Banalsite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Banalsite

BaNa2Al4Si4O16
Dana No: 76.1.6.1 Strunz No: VIII/J.07-100
Locality:

Notes: