Silinaite Mineral Data
General Silinaite Information
Chemical Formula:
NaLiSi2O5•2(H2O)
Composition:
Molecular Weight = 202.13 gm
Sodium 11.37 % Na 15.33 % Na2 O
Lithium 3.43 % Li 7.39 % Li2 O
Silicon 27.79 % Si 59.45 % SiO2
Hydrogen 1.99 % H 17.83 % H2 O
Oxygen 55.41 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
NaLiSi2 O5 •2(H2 O)
Environment:
In sodalite syenite xenoliths in nepheline syenite in an intrusive alkalic gabbro-syenite complex.
IMA Status:
Approved IMA 1991
Locality:
Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.
Name Origin:
For SIlicon, LIthium, and sodium, NAtrium, in the composition.
Name Pronunciation:
Silinaite + Pronunciation
Synonym:
ICSD 63718
IMA1990-028
PDF 44-1410
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 - Prismatic H-M Symbol (2/m) Space Group: A2/n
X Ray Diffraction:
By Intensity(I/Io ): 2.847(1), 4.14(1), 7.14(1),
Physical Properties of Silinaite
Cleavage:
{001} Perfect, {010} Good, {110} Good
Color:
Colorless, White.
Density:
2.24
Diaphaneity:
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 Ncalc = 1.53
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:
Bulk Density (Electron Density)=2.25 gm/cc note: Specific Gravity of Silinaite =2.23 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PESilinaite = 1.31 barns/electronU=PESilinaite x r Electron Density= 2.96 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Silinaite is Not Radioactive
Silinaite Classification
Dana Class:
74.03.05.03 (74) Phyllosilicate Modulated Layers
(74.03) with joined strips
(74.03.05) Na phyllosilicates
74.03.05.01 Natrosilite Na2Si2O5 P 21 /a 2/m
74.03.05.02 Makatite Na2Si4O8(OH)2•4(H2O) P 21 /c 2/m
74.03.05.03 Silinaite NaLiSi2O5•2(H2O) A2/n 2/m
74.03.05.04 Searlesite NaBSi2O5(OH)2 P 21 2
Strunz Class:
09.EF.20 09 - SILICATES (Germanates)
09.E - Phyllosilicates
09.EF -Single nets with 6-membered rings, � other rings
09.EF.20 Silinaite NaLiSi2O5•2(H2O) A2/n 2/m
Other Silinaite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.76,p2023,1991) OPTIC PROP.(Am.Min.,Vol.76,p2023,1991)
See Also:
Links to other databases for Silinaite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
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Silinaite
NaLiSi2O5•2(H2O)
Dana No: 74.03.05.03 Strunz No: 09.EF.20
Locality:
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