Mineralogy Database

Brewsterite-Ba Mineral Data

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General Brewsterite-Ba Information

Help on Chemical  Formula: Chemical Formula: (Ba,Sr)Al2Si6O16•5(H2O)
Help on Composition: Composition: Molecular Weight = 693.44 gm
   Barium     14.85 %  Ba   16.58 % BaO
   Strontium   3.16 %  Sr    3.74 % SrO
   Aluminum    7.78 %  Al   14.70 % Al2O3
   Silicon    24.30 %  Si   51.99 % SiO2
   Hydrogen    1.45 %  H    12.99 % H2O
   Oxygen     48.45 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba0.75Sr0.25Al2Si6O16•5(H2O)
Help on Environment: Environment: Secondary mineral in metamorphosed calc-silicates. The Ba-dominant member of the brewsterite series.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Discovered at the No. 4 wollastonite mine of the Gouverneur Talc Co., near Harrisville, Lewis County, New York, U.S.A. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the barium analogue of brewterite-Sr (formerly bariumbrewsterite).
Help on Name Pronunciation: Name Pronunciation: Brewsterite-Ba + Pronunciation Say BREWSTERITE-BA
Help on Synonym: Synonym: Bariumbrewsterite

Brewsterite-Ba Image

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Comments: Colorless to off-white striated prismatic brewsterite-Ba crystals.
Location: Strontian, North West Highlands (Argyllshire), Scotland, UK. Scale: See Image.
© Rruff Database

Brewsterite-Ba Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3852:1:0.4393
Help on Cell Dimensions: Cell Dimensions: a = 6.78, b = 17.599, c = 7.733, Z = 2; beta = 94.47° V = 919.90 Den(Calc)= 2.50
Help on Crystal System: Crystal System: Monoclinic Space Group: P 21/m,P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.66(1), 2.922(0.8), 3.268(0.4),

Physical Properties of Brewsterite-Ba

Help on Color: Color: White, Colorless, Pale pink.
Help on Density: Density: 2.453
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Brewsterite-Ba

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2069,KPDmeas= 0.2108,KC= 0.2094
Ncalc = 1.51 - 1.52
Help on Optical Data: Optical Data: Biaxial (+), a=1.51-1.514, b=1.512-1.516, g=1.523-1.528, bire=0.0130-0.0140, 2V(Calc)=46-48, 2V(Meas)=44-45.

Calculated Properties of Brewsterite-Ba

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.40 gm/cc
note: Specific Gravity of Brewsterite-Ba =2.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEBrewsterite-Ba = 65.44 barns/electron
U=PEBrewsterite-Ba x rElectron Density= 157.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brewsterite-Ba is Not Radioactive

Brewsterite-Ba Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.07)Brewsterite and related species Brewsterite-Sr (Sr,Ba)Al4Si12O32•10(H2O) P 21/m 2/m Brewsterite-Ba! (Ba,Sr)Al2Si6O16•5(H2O) P 21/m,P 21 Mono Yugawaralite CaAl2Si6O16•4(H2O) Pc m Goosecreekite CaAl2Si6O16•5(H2O) P 21 2 Roggianite Ca2[Be(OH)2Al2Si4O13]•<2•5(H2O) I 4/mcm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.GE.20 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GE -Chains of T10O20 Tetrahedra
09.GE.20 Brewsterite-Ba! (Ba,Sr)Al2Si6O16•5(H2O) P 21/m,P 21 Mono
09.GE.20 Brewsterite-Sr (Sr,Ba)Al4Si12O32•10(H2O) P 21/m 2/m

Other Brewsterite-Ba Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(Am.Min.,Vol.78,p1318,1993) OPTIC PROP.(Am.Min.,Vol.78,p1318,1993)
Help on See Also: See Also: Links to other databases for Brewsterite-Ba :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.GE.20





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