Mineralogy Database

Natrosilite Mineral Data

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General Natrosilite Information

Help on Chemical  Formula: Chemical Formula: Na2Si2O5
Help on Composition: Composition: Molecular Weight = 182.15 gm
   Sodium   25.24 %  Na   34.03 % Na2O
   Silicon  30.84 %  Si   65.97 % SiO2
   Oxygen   43.92 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Si2O5
Help on Environment: Environment: In pegmatites in nepheline syenites in differentiated alkalic massifs.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: On Mt. Karnasurt, Lovozero massif, and in the Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For sodium, NATRium, and SILicon in the composition.
Help on Name Pronunciation: Name Pronunciation: Natrosilite + Pronunciation Say NATROSILITE
Help on Synonym: Synonym: ICSD 34688
  PDF 29-1261
 

Natrosilite Image

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  Natrosilite

Comments: Colorless, clear to translucent crystalline natrosilite fragment, found in pale pink ussingite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natrosilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.5204:1:1.6946
Help on Cell Dimensions: Cell Dimensions: a = 12.3, b = 4.88, c = 8.27, Z = 4; beta = 104.23° V = 481.17 Den(Calc)= 2.51
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.06(1), 2.98(0.9), 3.97(0.8),
 

Physical Properties of Natrosilite

Help on Cleavage: Cleavage: {100} Perfect, {001} Distinct, {011} Indistinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.48
Help on Diaphaneity: Diaphaneity: Transparent
Help on Streak: Streak: white
 

Optical Properties of Natrosilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2052,KPDmeas= 0.2077,KC= 0.2019
Ncalc = 1.5 - 1.51
Help on Optical Data: Optical Data: Biaxial (-), a=1.507, b=1.517, g=1.521, bire=0.0140, 2V(Calc)=64, 2V(Meas)=49-64.
 

Calculated Properties of Natrosilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.48 gm/cc
note: Specific Gravity of Natrosilite =2.51 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PENatrosilite = 1.58 barns/electron
U=PENatrosilite x rElectron Density= 3.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrosilite is Not Radioactive
 

Natrosilite Classification

Help on  Dana Class: Dana Class: 74.03.05.01 (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
Help on  Strunz Class: Strunz Class: 09.EE.40 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
 
09.EE.40 Natrosilite Na2Si2O5 P 21/a 2/m
 

Other Natrosilite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Natrosilite :
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

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

Natrosilite

Na2Si2O5
Dana No: 74.03.05.01 Strunz No: 09.EE.40
Locality:

 

Notes:

 

 
   
 


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