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Brewsterite-Sr Mineral Data

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General Brewsterite-Sr Information

Help on Chemical  Formula: Chemical Formula: (Sr,Ba)Al4Si12O32•10(H2O)
Help on Composition: Composition: Molecular Weight = 1,330.04 gm
   Potassium   0.06 %  K     0.07 % K2O
   Barium      4.96 %  Ba    5.53 % BaO
   Strontium   9.35 %  Sr   11.06 % SrO
   Aluminum    8.36 %  Al   15.79 % Al2O3
   Silicon    25.23 %  Si   53.98 % SiO2
   Hydrogen    1.52 %  H    13.54 % H2O
   Oxygen     50.52 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr1.42Ba0.48K0.02Al4.12Si11.95O32•10(H2O)
Help on Environment: Environment: A hydrothermal mineral occurring in vugs of massive volcanic rocks and in veins. Renamed by the zeolite commission to brewsterite-Sr.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1822
Help on Locality: Locality: Strontian at Argyleshite, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after David Brewster (1781-1868), Scottish physicist, who studied the optical properties of minerals and the element Strontium.
Help on Name Pronunciation: Name Pronunciation: Brewsterite-Sr + Pronunciation Say BREWSTERITE-SR
Help on Synonym: Synonym: Brewsterite
  Strontiumbrewsterite
 

Brewsterite-Sr Image

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  Brewsterite-Sr

Comments: Translucent brewsterite crystals on matrix.
Location: Yellow Lake, Olalla, Osoyoos Mining Division, British Columbia, Canada. Scale: 35x30x20 mm.
© John Betts - Fine Minerals

Brewsterite-Sr Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3865:1:0.4415
Help on Cell Dimensions: Cell Dimensions: a = 6.793, b = 17.573, c = 7.759, Z = 1; beta = 94.54° V = 923.31 Den(Calc)= 2.39
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
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-Sr

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: White, Yellowish white, Gray..
Help on Density: Density: 2.45
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Brewsterite-Sr

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2155,KPDmeas= 0.2102,KC= 0.2143
Ncalc = 1.51 - 1.53
Help on Optical Data: Optical Data: Biaxial (+), a=1.51, b=1.512, g=1.523, bire=0.0130
 

Calculated Properties of Brewsterite-Sr

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Brewsterite-Sr =2.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEBrewsterite-Sr = 31.34 barns/electron
U=PEBrewsterite-Sr x relectron= 74.12 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 0.85 (Gamma Ray American Petroleum Institute Units)
Concentration of Brewsterite-Sr per GRapi unit =117.90 (%)

Estimated Radioactivity from Brewsterite-Sr - barely detectable

 

Brewsterite-Sr Classification

Help on  Dana Class: Dana Class: 77.01.07.01 (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
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-Sr Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Brewsterite-Sr :
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-Sr Specimen Label here :

Brewsterite-Sr

(Sr,Ba)Al4Si12O32•10(H2O)
Dana No: 77.01.07.01 Strunz No: 09.GE.20
Locality:

 

Notes:

 

 
   
 


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