Brewsterite-Sr Mineral Data

Brewsterite-Sr Mineral Data +

General Brewsterite-Sr Information

Chemical Formula:

(Sr,Ba)Al4Si12O32·10(H2O)

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

Empirical Formula:

Sr_1.42Ba_0.48K_0.02Al_4.12Si_11.95O₃₂·10(H₂O)

Environment:

A hydrothermal mineral occurring in vugs of massive volcanic rocks and in veins. Renamed by the zeolite commission to brewsterite-Sr.

IMA Status:

Valid Species (Pre-IMA) 1822

Locality:

Strontian at Argyleshite, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named after David Brewster (1781-1868), Scottish physicist, who studied the optical properties of minerals and the element Strontium.

Synonym:

Brewsterite

Strontiumbrewsterite

Brewsterite-Sr Image

Images:

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

Axial Ratios:

a:b:c =0.3865:1:0.4415

Cell Dimensions:

a = 6.793, b = 17.573, c = 7.759, Z = 1; beta = 94.54° V = 923.31 Den(Calc)= 2.39

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ 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: {011} sector

View Additional jPOWD Structure files for Brewsterite-Sr
[1] [2] [3] [4]

Physical Properties of Brewsterite-Sr

Cleavage:

[010] Perfect

Color:

White, Yellowish white, Gray..

Density:

2.45

Diaphaniety:

Transparent to translucent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Brewsterite-Sr

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

Optical Data:

Biaxial (+), a=1.51, b=1.512, g=1.523, bire=0.0130

Calculated Properties of Brewsterite-Sr

Electron Density:

r_electron=2.37 gm/cc
note: r_{Brewsterite-Sr}=2.39 gm/cc.

Fermion Index

Fermion Index = 0.0274
Boson Index = 0.9726

Photoelectric:

PE_{Brewsterite-Sr}= 31.34 barns/electron
U=PE_{Brewsterite-Sr} x r_electron= 74.12 barns/cc.

Radioactivity:

GRapi = 0.85 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Brewsterite-Sr - barely detectable

Brewsterite-Sr Classification

Dana Class:

77.1.7.1 (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.23-80 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-Sr Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Brewsterite-Sr :
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-Sr

(Sr,Ba)Al4Si12O32·10(H2O)
Dana No: 77.1.7.1 Strunz No: VIII/J.23-80
Locality:

Notes: