Ertixiite Mineral Data

General Ertixiite Information

Chemical Formula:

Na2Si4O9

Composition:

Molecular Weight = 302.32 gm

Sodium 15.21 % Na 20.50 % Na₂O

Silicon 37.16 % Si 79.50 % SiO₂

Oxygen 47.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Si₄O₉

Environment:

Miarolytic cavities in Ta-Nb-Be pegmatites.

IMA Status:

Approved IMA 1985

Locality:

Altai No. 3 pegmatite, Ertixi River, Fuyun, Xinjiang Autonomous Region, China. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Ertixiite + Pronunciation

Ertixiite Crystallography

Cell Dimensions:

a = 5.975, Z = 1; V = 213.31 Den(Calc)= 2.35

Crystal System:

Isometric - Diploidal H-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 1.798(1), 1.996(0.8), 3.443(0.2),

Physical Properties of Ertixiite

Cleavage:

None

Color:

Colorless, White.

Density:

2.35

Diaphaneity:

Transparent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

5.8-6.5

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ertixiite

Gladstone-Dale:

CI meas= -0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2136,KPDmeas= 0.2136,KC= 0.2043
Ncalc = 1.48

Optical Data:

Isotropic, n=1.502.

Calculated Properties of Ertixiite

Electron Density:

Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Ertixiite =2.35 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Ertixiite= 1.67 barns/electron
U=PE_Ertixiite x rElectron Density= 3.89 barns/cc.

Radioactivity:

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

Ertixiite Classification

Dana Class:

78.07.03.01 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.03)Dana Group

78.07.03.01 Ertixiite Na2Si4O9 P a3 2/m 3

Strunz Class:

09.HA.05 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HA -With alkali and alkali-earth Elements

09.HA.05 Ertixiite Na2Si4O9 P a3 2/m 3

Other Ertixiite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ertixiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ertixiite

Na2Si4O9
Dana No: 78.07.03.01 Strunz No: 09.HA.05
Locality:

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