Silinaite Mineral Data

Silinaite Mineral Data +

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General Silinaite Information

Chemical Formula:

NaLiSi2O5·2(H2O)

Composition:

Molecular Weight = 202.13 gm

Sodium 11.37 % Na 15.33 % Na₂O

Lithium 3.43 % Li 7.39 % Li₂O

Silicon 27.79 % Si 59.45 % SiO₂

Hydrogen 1.99 % H 17.83 % H₂O

Oxygen 55.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaLiSi₂O₅·2(H₂O)

IMA Status:

Approved IMA 1991

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 63718

IMA1990-028

PDF 44-1410

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Silinaite Crystallography

Axial Ratios:

a:b:c =0.6072:1:1.7258

Cell Dimensions:

a = 5.061, b = 8.334, c = 14.383, Z = 4; beta = 96.6° V = 602.63 Den(Calc)= 2.23

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/n

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

By Intensity(I/I_o): 2.847(1), 4.14(1), 7.14(1),

Crystal Structure:

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Grice J D , The Canadian Mineralogist , 29 (1991) p.363-367, The crystal structure of silinaite, NaLiSi2O6.2H20: a monophyllosilicate, Locality: Mont Saint-Hilaire, Rouville County, Quebec, Canada

Physical Properties of Silinaite

Cleavage:

[001] Perfect, [010] Good, [110] Good

Color:

Colorless, White.

Density:

2.24

Diaphaniety:

Translucent to Opaque

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Silinaite

Gladstone-Dale:

CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2315,KPDmeas= 0.2305,KC= 0.2361

Optical Data:

Biaxial (+), a=1.515, b=1.516, g=1.518, bire=0.0030, 2V(Calc)=72, 2V(Meas)=64-71.

Calculated Properties of Silinaite

Electron Density:

r_electron=2.25 gm/cc
note: r_Silinaite=2.23 gm/cc.

Fermion Index

Fermion Index = 0.01582
Boson Index = 0.98418

Photoelectric:

PE_Silinaite= 1.31 barns/electron
U=PE_Silinaite x r_electron= 2.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Silinaite is Not Radioactive

Silinaite Classification

Dana Class:

74.3.5.3 (74)Phyllosilicate Modulated Layers

(74.3)with joined strips

(74.3.5)Na phyllosilicates

74.3.5.1 Natrosilite Na2Si2O5 P 2₁/a 2/m

74.3.5.2 Makatite Na2Si4O8(OH)2·4(H2O) P 2₁/c 2/m

74.3.5.3 Silinaite NaLiSi2O5·2(H2O) A2/n 2/m

74.3.5.4 Searlesite NaBSi2O5(OH)2 P 2₁ 2

Strunz Class:

VIII/G.05-05 VIII - Silicates

VIII/G - Intermediate between chain- and layered silicates

VIII/G.05 - Silinaite - Makatite series

VIII/G.05-05 Silinaite NaLiSi2O5·2(H2O) A2/n 2/m

VIII/G.05-10 Searlesite NaBSi2O5(OH)2 P 2₁ 2

VIII/G.05-20 Makatite Na2Si4O8(OH)2·4(H2O) P 2₁/c 2/m

Other Silinaite Information

References:

PHYS. PROP.(Am.Min.,Vol.76,p2023,1991) OPTIC PROP.(Am.Min.,Vol.76,p2023,1991)

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Print or Cut-and-Paste your Silinaite Specimen Label here :

Silinaite

NaLiSi2O5·2(H2O)
Dana No: 74.3.5.3 Strunz No: VIII/G.05-05
Locality:

Notes: