Sogdianite Mineral Data

Sogdianite Mineral Data +

General Sogdianite Information

Chemical Formula:

(K,Na)2(Li,Fe+++,Al)3ZrSi12O30

Composition:

Molecular Weight = 1,049.22 gm

Potassium 5.59 % K 6.73 % K₂O

Sodium 1.10 % Na 1.48 % Na₂O

Lithium 1.19 % Li 2.56 % Li₂O

Zirconium 8.69 % Zr 11.74 % ZrO₂

Aluminum 0.77 % Al 1.46 % Al₂O₃

Iron 4.79 % Fe 6.85 % Fe₂O₃

Silicon 32.12 % Si 68.72 % SiO₂

Oxygen 45.75 % O

______ ______

100.00 % 99.54 % = TOTAL OXIDE

Empirical Formula:

K_1.5Na_0.5Li_1.8Fe³⁺_0.9Al_0.3ZrSi₁₂O₃₀

IMA Status:

Approved IMA 1968

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 89899

PDF 21-501

Sogdianite Image

Images:

Sogdianite

Comments: Somewhat greasy to vitreous massive sogdianite.
Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sogdianite Crystallography

Axial Ratios:

a:c = 1:1.39695

Cell Dimensions:

a = 10.059, c = 14.052, Z = 2; V = 1,231.34 Den(Calc)= 2.83

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm

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

By Intensity(I/I_o): 2.89(1), 3.19(1), 4.08(0.9),

Crystal Structure:

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Cooper M A , Hawthorne F C , Grew E S , American Mineralogist , 84 (1999) p.764-768, The crystal chemistry of sogdianite, a milarite-group mineral, Note: U(1,2) for Li2 changed to match symmetry constraints.

View Additional jPOWD Structure files for Sogdianite
[1]

Physical Properties of Sogdianite

Cleavage:

[0001] Perfect

Color:

Violet.

Density:

2.9

Diaphaniety:

Transparent

Hardness:

7 - Quartz

Luster:

Vitreous (Glassy)

Optical Properties of Sogdianite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2145,KPDmeas= 0.2093,KC= 0.2162

Optical Data:

Uniaxial (-), e=1.606, w=1.608, bire=0.0020.

Calculated Properties of Sogdianite

Electron Density:

r_electron=2.78 gm/cc
note: r_Sogdianite=2.83 gm/cc.

Fermion Index

Fermion Index = 0.02689
Boson Index = 0.97311

Photoelectric:

PE_Sogdianite= 14.67 barns/electron
U=PE_Sogdianite x r_electron= 40.74 barns/cc.

Radioactivity:

GRapi = 79.14 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Sogdianite - barely detectable

Sogdianite Classification

Dana Class:

63.2.1a.13 (63)Cyclosilicate Condensed Rings

(63.2)Milarite - Osumilite type (6x2) Double Rings

(63.2.1a)Milarite - Osumilite group (Milarite - Osumilite subgroup)

63.2.1a.1 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.2 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

63.2.1a.3 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

63.2.1a.4 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.5 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.6 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.7 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.8 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.9 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

63.2.1a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.12 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m

63.2.1a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

63.2.1a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

63.2.1a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.16 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m

63.2.1a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

63.2.1a.18 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m

63.2.1a.19 IMA2003-045a! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m

Strunz Class:

VIII/E.22-120 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 Sogdianite Information

References:

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

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Sogdianite

(K,Na)2(Li,Fe+++,Al)3ZrSi12O30
Dana No: 63.2.1a.13 Strunz No: VIII/E.22-120
Locality:

Notes: