Natrosilite Mineral Data

Natrosilite Mineral Data +

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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

IMA Status:

Approved IMA 1975

Locality:

Link to MinDat.org Location Data.

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 - PrismaticH-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

Diaphaniety:

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

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:

r_electron=2.48 gm/cc
note: r_Natrosilite=2.51 gm/cc.

Fermion Index

Fermion Index = 0.01461
Boson Index = 0.98539

Photoelectric:

PE_Natrosilite= 1.58 barns/electron
U=PE_Natrosilite x r_electron= 3.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natrosilite is Not Radioactive

Natrosilite Classification

Dana Class:

74.3.5.1 (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/H.05-10 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.05 - Natrosilite - Revdite series

VIII/H.05-10 Natrosilite Na2Si2O5 P 2₁/a 2/m

VIII/H.05-30 Kanemite NaHSi2O5·3(H2O) P bcn 2/m 2/m 2/m

VIII/H.05-40 Revdite Na2Si2O5·5(H2O) C 2 2

Other Natrosilite Information

References:

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

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Natrosilite

Na2Si2O5
Dana No: 74.3.5.1 Strunz No: VIII/H.05-10
Locality:

Notes: