Emeleusite Mineral Data

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

IMA Status:

Approved IMA 1978

Locality:

Link to MinDat.org Location Data.

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 - DipyramidalH-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),

Crystal Structure:

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Johnsen O , Nielsen K , Sotofte I , Zeitschrift fur Kristallographie , 147 (1978) p.297-306, The crystal structure of emeleusite,, a novel example of sechser-doppelkette, Locality: Igdlutalik Island, Julianchab District, Greenland

Physical Properties of Emeleusite

Cleavage:

None

Color:

Colorless, Pink white.

Density:

2.76

Diaphaniety:

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

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:

r_electron=2.72 gm/cc
note: r_Emeleusite=2.76 gm/cc.

Fermion Index

Fermion Index = 0.01873
Boson Index = 0.98127

Photoelectric:

PE_Emeleusite= 4.60 barns/electron
U=PE_Emeleusite x r_electron= 12.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Emeleusite is Not Radioactive

Emeleusite Classification

Dana Class:

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

(66.3)with chains P>2

(66.3.4)P=6 (Tahualite group)

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

66.3.4.2 Zektzerite NaLiZrSi6O15 C mca 2/m 2/m 2/m

66.3.4.3 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m

Strunz Class:

VIII/E.22-100 VIII - Silicates

VIII/E - Cyklosilicates, double six rings [Si12O30]12-

VIII/E.22 - Millarite - Osumilite series

VIII/E.22-10 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-20 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m

VIII/E.22-22 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m

VIII/E.22-25 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

VIII/E.22-30 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-40 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

VIII/E.22-50 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

VIII/E.22-60 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-70 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

VIII/E.22-80 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-90 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-100 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m

VIII/E.22-110 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-120 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

VIII/E.22-125 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-130 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

VIII/E.22-133 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m

VIII/E.22-135 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-140 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-150 Armenite BaCa2Al6Si9O30·2(H2O) Pnc2 mm2

Other Emeleusite Information

References:

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

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Emeleusite

Na4Li2Fe+++2Si12O30
Dana No: 66.3.4.3 Strunz No: VIII/E.22-100
Locality:

Notes: