Mineralogy Database

Banalsite Mineral Data

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General Banalsite Information

Help on Chemical  Formula: Chemical Formula: BaNa2Al4Si4O16
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: BaNa2Al4Si4O16
Help on Environment: Environment: Found in a vein in manganese ore. May form a series with stronalsite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1944
Help on Locality: Locality: Benalli mine, Rhiw, Lleyn Peninsula, Caernarvonshire, Wales, UK. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from a contraction of the component cation symbols: Ba, Na,Al, and Si.
Help on Name Pronunciation: Name Pronunciation: Banalsite + Pronunciation Say BANALSITE
Help on Synonym: Synonym: ICSD 4447
  PDF 38-401

Banalsite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.8529:1:1.6768
Help on Cell Dimensions: Cell Dimensions: a = 8.54, b = 10.0127, c = 16.7897, Z = 4; V = 1,435.66 Den(Calc)= 3.05
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Iba2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.07(1), 3.19(1), 3.5(1),

Physical Properties of Banalsite

Help on Cleavage: Cleavage: {110} Good, {001} Good
Help on Color: Color: White.
Help on Density: Density: 3.065
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Banalsite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.90 gm/cc
note: Specific Gravity of Banalsite =3.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEBanalsite = 88.93 barns/electron
U=PEBanalsite x rElectron Density= 258.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Banalsite is Not Radioactive

Banalsite Classification

Help on  Dana Class: Dana Class: (76)Tectosilicate Al-Si Framework
  (76.01)with Al-Si frameworks
  (76.01.06)Banalsite group Banalsite BaNa2Al4Si4O16 Iba2 mm2 Stronalsite SrNa2Al4Si4O16 Iba2 mm2 Lisetite Na2CaAl4Si4O16 Pbc2 mm2 Svyatoslavite CaAl2Si2O8 P 21 2
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin 91:1953) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 09.FA.60





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