Brewsterite-Ba Mineral Data

Brewsterite-Ba Mineral Data +

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General Brewsterite-Ba Information

Chemical Formula:

(Ba,Sr)Al2Si6O16·5(H2O)

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

Empirical Formula:

Ba_0.75Sr_0.25Al₂Si₆O₁₆·5(H₂O)

Environment:

Secondary mineral in metamorphosed calc-silicates. The Ba-dominant member of the brewsterite series.

IMA Status:

Approved IMA 1998 (Dana # Added)

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.

Name Origin:

Named as the barium analogue of brewterite-Sr (formerly bariumbrewsterite).

Synonym:

Bariumbrewsterite

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Brewsterite-Ba Crystallography

Axial Ratios:

a:b:c =0.3852:1:0.4393

Cell Dimensions:

a = 6.78, b = 17.599, c = 7.733, Z = 2; beta = 94.47° V = 919.90 Den(Calc)= 2.50

Crystal System:

MonoclinicSpace Group: P 2₁/m,P 2₁

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

By Intensity(I/I_o): 4.66(1), 2.922(0.8), 3.268(0.4),

Crystal Structure:

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Akizuki M , Kudoh Y , Kuribayashi T , American Mineralogist , 81 (1996) p.1501-1506, Crystal structures of the {011}, {610}, and {010} growth sectors in brewsterite, Sample: {610} sector

View Additional jPOWD Structure files for Brewsterite-Ba
[1]

Physical Properties of Brewsterite-Ba

Color:

White, Colorless, Pale pink.

Density:

2.453

Diaphaniety:

Transparent

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Brewsterite-Ba

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

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

Electron Density:

r_electron=2.40 gm/cc
note: r_{Brewsterite-Ba}=2.45 gm/cc.

Fermion Index

Fermion Index = 0.04026
Boson Index = 0.95974

Photoelectric:

PE_{Brewsterite-Ba}= 65.44 barns/electron
U=PE_{Brewsterite-Ba} x r_electron= 157.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brewsterite-Ba is Not Radioactive

Brewsterite-Ba Classification

Dana Class:

77.1.7.1a (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.7)Brewsterite and related species

77.1.7.1 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 2₁/m 2/m

77.1.7.1a Brewsterite-Ba ! (Ba,Sr)Al2Si6O16·5(H2O) P 2₁/m,P 2₁ Mono

77.1.7.2 Yugawaralite CaAl2Si6O16·4(H2O) Pc m

77.1.7.3 Goosecreekite CaAl2Si6O16·5(H2O) P 2₁ 2

77.1.7.4 Roggianite Ca2[Be(OH)2Al2Si4O13]·<2·5(H2O) I 4/mcm 4/m 2/m 2/m

Strunz Class:

VIII/J.23-90 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.23 - Zeolite group, Heulandite - Barium-brewsterite series

VIII/J.23-06 Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-08 Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m

VIII/J.23-10 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-12 Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono

VIII/J.23-18 Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

VIII/J.23-20 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono

VIII/J.23-22 Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m

VIII/J.23-26 Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

VIII/J.23-30 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m

VIII/J.23-40 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m

VIII/J.23-50 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m

VIII/J.23-60 Goosecreekite CaAl2Si6O16·5(H2O) P 2₁ 2

VIII/J.23-70 Epistilbite CaAl2Si6O16·5(H2O) C1 1

VIII/J.23-80 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 2₁/m 2/m

VIII/J.23-90 Brewsterite-Ba (Ba,Sr)Al2Si6O16·5(H2O) P 2₁/m,P 2₁ Mono

Other Brewsterite-Ba Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(Am.Min.,Vol.78,p1318,1993) OPTIC PROP.(Am.Min.,Vol.78,p1318,1993)

See Also:

Links to other databases for Brewsterite-Ba :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Brewsterite-Ba

(Ba,Sr)Al2Si6O16·5(H2O)
Dana No: 77.1.7.1a Strunz No: VIII/J.23-90
Locality:

Notes: