Brewsterite-Ba Mineral Data (original) (raw)
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:
Ba0.75Sr0.25Al2Si6O16•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).
Name Pronunciation:
Brewsterite-Ba + Pronunciation 
Synonym:
Bariumbrewsterite
Brewsterite-Ba Image
Images:
 |
Brewsterite-Ba Comments: Colorless to off-white striated prismatic brewsterite-Ba crystals. Location: Strontian, North West Highlands (Argyllshire), Scotland, UK.Scale: See Image. © Rruff Database |
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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
X Ray Diffraction:
By Intensity(I/Io): 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
Diaphaneity:
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
Ncalc = 1.51 - 1.52
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:
Bulk Density (Electron Density)=2.40 gm/cc
note: Specific Gravity of Brewsterite-Ba =2.45 gm/cc.
Fermion Index:
Fermion Index = 0.04
Boson Index = 0.96
Photoelectric:
PEBrewsterite-Ba = 65.44 barns/electron
U=PEBrewsterite-Ba x rElectron Density= 157.17 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brewsterite-Ba is Not Radioactive
Brewsterite-Ba Classification
Dana Class:
77.01.07.01a (77)Tectosilicate Zeolite group
(77.01)true zeolites
(77.01.07)Brewsterite and related species
77.01.07.01 Brewsterite-Sr (Sr,Ba)Al4Si12O32•10(H2O) P 21/m 2/m
77.01.07.01a Brewsterite-Ba! (Ba,Sr)Al2Si6O16•5(H2O) P 21/m,P 21 Mono
77.01.07.02 Yugawaralite CaAl2Si6O16•4(H2O) Pc m
77.01.07.03 Goosecreekite CaAl2Si6O16•5(H2O) P 21 2
77.01.07.04 Roggianite Ca2[Be(OH)2Al2Si4O13]•<2•5(H2O) I 4/mcm 4/m 2/m 2/m
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
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 - 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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Print or Cut-and-Paste your Brewsterite-Ba Specimen Label here :
Brewsterite-Ba
(Ba,Sr)Al2Si6O16•5(H2O)
Dana No: 77.01.07.01a Strunz No: 09.GE.20
Locality:
Notes: