Emeleusite Mineral Data

General Emeleusite Information

Chemical Formula:

Na4Li2Fe+++2Si12O30

Composition:

Molecular Weight = 1,034.54 gm

Sodium 8.89 % Na 11.98 % Na₂O

Lithium 1.34 % Li 2.89 % Li₂O

Iron 10.80 % Fe 15.44 % Fe₂O₃

Silicon 32.58 % Si 69.69 % SiO₂

Oxygen 46.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄Li₂Fe³⁺₂Si₁₂O₃₀

Environment:

A minor constituent of a peralkalic trachyte dike, inflow-banded aegirine-albite-rich layers.

IMA Status:

Approved IMA 1978

Locality:

On the Island of Igdlutalik, Julianehab district, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for Charles Henry Emeleus, University of Durham, Durham, England.

Name Pronunciation:

Emeleusite + Pronunciation

Synonym:

ICSD 34950

PDF 29-832

Emeleusite Image

Images:

Emeleusite

Comments: Clear to pale tan glassy crystalline emeleusite with white albite and dark green aegirine.
Location: Igdlutalik, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Emeleusite Crystallography

Axial Ratios:

a:b:c =0.5805:1:0.8074

Cell Dimensions:

a = 10.073, b = 17.35, c = 14.01, Z = 4; V = 2,448.48 Den(Calc)= 2.81

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnna

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

By Intensity(I/I_o): 4.352(1), 3.209(0.8), 3.501(0.7),

Physical Properties of Emeleusite

Cleavage:

None

Color:

Colorless, Pink white.

Density:

2.76

Diaphaneity:

Transparent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Emeleusite

Gladstone-Dale:

CI meas= 0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2162,KC= 0.2252
Ncalc = 1.62 - 1.63

Optical Data:

Biaxial (-), a=1.596, b=1.597, g=1.597, bire=0.0010, 2V(Calc)=0, 2V(Meas)=0-5.

Calculated Properties of Emeleusite

Electron Density:

Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Emeleusite =2.76 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Emeleusite= 4.60 barns/electron
U=PE_Emeleusite x rElectron Density= 12.51 barns/cc.

Radioactivity:

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

Emeleusite Classification

Dana Class:

66.03.04.03 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.03)with chains P>2

(66.03.04)P=6 (Tahualite group)

66.03.04.01 Tuhualite [](Na,K)FeFe[Si6O15] C mca 2/m 2/m 2/m

66.03.04.02 Zektzerite NaLiZrSi6O15 C mca 2/m 2/m 2/m

66.03.04.03 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m

Strunz Class:

09.DN.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DN -Inosilicates with 6-periodic double chains

09.DN.05 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m

09.DN.05 Tuhualite [](Na,K)FeFe[Si6O15] C mca 2/m 2/m 2/m

09.DN.05 Zektzerite NaLiZrSi6O15 C mca 2/m 2/m 2/m

Other Emeleusite 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 Emeleusite :
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
15 - WWW-MINCRYST

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Emeleusite

Na4Li2Fe+++2Si12O30
Dana No: 66.03.04.03 Strunz No: 09.DN.05
Locality:

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