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.

Name Pronunciation:

Banalsite + Pronunciation

Synonym:

ICSD 4447

PDF 38-401

Banalsite Image

Images:

Banalsite

Comments: Massive brown to flesh colored banalsite in matrix.
Location: Benallt Mine, Lleyn Peninsula, Wales, UK. Scale: Specimen Size 5x6 cm.
© Diederik Visser

Banalsite Crystallography

Axial Ratios:

a:b:c =0.8529:1:1.6768

Cell Dimensions:

a = 8.54, b = 10.0127, c = 16.7897, Z = 4; V = 1,435.66 Den(Calc)= 3.05

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Iba2

$Help on X Ray Diffraction:$ 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

Diaphaneity:

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= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1878,KPDmeas= 0.1868,KC= 0.1874
Ncalc = 1.57

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:

Bulk Density (Electron Density)=2.90 gm/cc
note: Specific Gravity of Banalsite =3.05 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Banalsite= 88.93 barns/electron
U=PE_Banalsite x rElectron Density= 258.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Banalsite is Not Radioactive

Banalsite Classification

Dana Class:

76.01.06.01 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.06)Banalsite group

76.01.06.01 Banalsite BaNa2Al4Si4O16 Iba2 mm2

76.01.06.02 Stronalsite SrNa2Al4Si4O16 Iba2 mm2

76.01.06.03 Lisetite Na2CaAl4Si4O16 Pbc2 mm2

76.01.06.04 Svyatoslavite CaAl2Si2O8 P 2₁ 2

Strunz Class:

09.FA.60 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.60 Banalsite BaNa2Al4Si4O16 Iba2 mm2

09.FA.60 Stronalsite SrNa2Al4Si4O16 Iba2 mm2

Other Banalsite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin 91:1953) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Banalsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Banalsite Specimen Label here :

Banalsite

BaNa2Al4Si4O16
Dana No: 76.01.06.01 Strunz No: 09.FA.60
Locality:

Notes: