Stronalsite Mineral Data

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General Stronalsite Information

Chemical Formula:

SrNa2Al4Si4O16

Composition:

Molecular Weight = 609.86 gm

Sodium 7.54 % Na 10.16 % Na₂O

Strontium 14.37 % Sr 16.99 % SrO

Aluminum 17.70 % Al 33.44 % Al₂O₃

Silicon 18.42 % Si 39.41 % SiO₂

Oxygen 41.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SrNa₂Al₄Si₄O₁₆

Environment:

Basic tuff xenoliths.

IMA Status:

Approved IMA 1987

Locality:

Rendai, Kochi City, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for its composition (Strontium, Na, Al, Si).

Stronalsite Image

Images:

Stronalsite Jadeite

Comments: White stronalsite veinlets in massive pale green jadeite.
Location: Ohasa, Okayama, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Stronalsite Crystallography

Axial Ratios:

a:b:c =0.8503:1:1.6883

Cell Dimensions:

a = 8.407, b = 9.886, c = 16.691, Z = 4; V = 1,387.22 Den(Calc)= 2.92

Crystal System:

OrthorhombicSpace Group: I bam,Iba2

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

By Intensity(I/I_o): 3.206(1), 3.504(0.8), 3.184(0.72),

Crystal Structure:

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Liferovich R P , Locock A J , Mitchell R H , Shpachenko A K , The Canadian Mineralogist , 44 (2006) p.533-546, The crystal structure of stronalsite and a, redetermination of the structure of banalsite, Locality: Khibina peralkaline complex, Kola alkaline province, Russia

Physical Properties of Stronalsite

Cleavage:

[100] Good, [001] Good

Color:

White.

Density:

2.95

Diaphaniety:

Transparent

Hardness:

6.5 - Pyrite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Stronalsite

Gladstone-Dale:

CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1942,KPDmeas= 0.1922,KC= 0.1951

Optical Data:

Biaxial (+), a=1.563, b=1.564, g=1.574, bire=0.0110, 2V(Calc)=36, 2V(Meas)=32.

Calculated Properties of Stronalsite

Electron Density:

r_electron=2.83 gm/cc
note: r_Stronalsite=2.92 gm/cc.

Fermion Index

Fermion Index = 0.01886
Boson Index = 0.98114

Photoelectric:

PE_Stronalsite= 17.00 barns/electron
U=PE_Stronalsite x r_electron= 48.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stronalsite is Not Radioactive

Stronalsite Classification

Dana Class:

76.1.6.2 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.6)Banalsite group

76.1.6.1 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m

76.1.6.2 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho

76.1.6.3 Lisetite Na2CaAl4Si4O16 Pbc2 mm2

76.1.6.4 Svyatoslavite CaAl2Si2O8 P 2₁ 2

Strunz Class:

VIII/J.07-90 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series

VIII/J.07-10 Anorthoclase (Na,K)AlSi3O8 C1 1

VIII/J.07-20 Albite NaAlSi3O8 C1 1

VIII/J.07-30 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-40 Andesine* (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-50 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-60 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-70 Anorthite CaAl2Si2O8 P1,I1 1

VIII/J.07-75 Dmisteinbergite CaAl2Si2O8 P 6/mmm 6/m 2/m 2/m

VIII/J.07-80 Svyatoslavite CaAl2Si2O8 P 2₁ 2

VIII/J.07-90 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho

VIII/J.07-100 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m

VIII/J.07-110 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m

Other Stronalsite Information

References:

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

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Stronalsite

SrNa2Al4Si4O16
Dana No: 76.1.6.2 Strunz No: VIII/J.07-90
Locality:

Notes: