Natrosilite Mineral Data

General Natrosilite Information

Chemical Formula:

Na2Si2O5

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

Empirical Formula:

Na₂Si₂O₅

Environment:

In pegmatites in nepheline syenites in differentiated alkalic massifs.

IMA Status:

Approved IMA 1975

Locality:

On Mt. Karnasurt, Lovozero massif, and in the Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For sodium, NATRium, and SILicon in the composition.

Name Pronunciation:

Natrosilite + Pronunciation

Synonym:

ICSD 34688

PDF 29-1261

Natrosilite Image

Images:

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

Axial Ratios:

a:b:c =2.5204:1:1.6946

Cell Dimensions:

a = 12.3, b = 4.88, c = 8.27, Z = 4; beta = 104.23° V = 481.17 Den(Calc)= 2.51

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/I_o): 6.06(1), 2.98(0.9), 3.97(0.8),

Physical Properties of Natrosilite

Cleavage:

{100} Perfect, {001} Distinct, {011} Indistinct

Color:

Colorless, White.

Density:

2.48

Diaphaneity:

Transparent

Streak:

white

Optical Properties of Natrosilite

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

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

Electron Density:

Bulk Density (Electron Density)=2.48 gm/cc
note: Specific Gravity of Natrosilite =2.51 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Natrosilite= 1.58 barns/electron
U=PE_Natrosilite x rElectron Density= 3.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrosilite is Not Radioactive

Natrosilite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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