Sobolevite Mineral Data

Sobolevite Mineral Data +

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General Sobolevite Information

Chemical Formula:

Na11(Na,Ca)4(Mg,Mn)Ti++++4(Si4O12)(PO4)4O5F3

Composition:

Molecular Weight = 1,378.43 gm

Sodium 22.52 % Na 30.35 % Na₂O

Calcium 4.65 % Ca 6.51 % CaO

Magnesium 0.35 % Mg 0.58 % MgO

Titanium 9.38 % Ti 15.65 % TiO₂

Manganese 3.19 % Mn 4.12 % MnO

Niobium 3.37 % Nb 4.82 % Nb₂O₅

Iron 0.41 % Fe 0.52 % FeO

Silicon 8.15 % Si 17.44 % SiO₂

Phosphorus 8.76 % P 20.08 % P₂O₅

Oxygen 38.54 % O

Fluorine 0.69 % F 0.69 % F

- % F -0.29 % -O=F₂

______ ______

100.00 % 100.46 % = TOTAL OXIDE

Empirical Formula:

Na_13.5Ca_1.6Mn²⁺_0.8Mg_0.2Fe²⁺_0.1Ti_2.7Nb_0.5P_3.9Si₄O_33.2F_0.5

Environment:

In alkalic pegmatite, cutting sodalite-cancrinite syenite, in a differentiated alkalic massif.

IMA Status:

Approved IMA 1983

Locality:

On Mt. Alluaiv, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Vladimir S. Sobolev (1908-1982), Soviet petrologist and former President of the Internatinal Mineralogical Association.

Synonym:

ICSD 63419

PDF 36-349

Sobolevite Image

Images:

Sobolevite

Comments: Translucent crystalline sobolevite cleavage.
Location: Mount Alluaiv, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sobolevite Crystallography

Axial Ratios:

a:b:c =1.3079:1:7.5058

Cell Dimensions:

a = 7.078, b = 5.4115, c = 40.618, Z = 2; alpha = 90.01°, beta = 93.19°, gamma = 90° V = 1,553.36 Den(Calc)= 2.95

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 2.896(1), 2.691(0.7), 2.913(0.5),

Crystal Structure:

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Sokolova E , Hawthorne F C , Khomyakov A P , The Canadian Mineralogist , 43 (2005) p.1527-1544, Polyphite and sobolevite: Revision of their crystal structures, Locality: Khibina-Lovozero alkaline complex, Kola peninsula, Russia

Physical Properties of Sobolevite

Cleavage:

[001] Perfect, [110] Distinct

Color:

Brown.

Density:

3.03

Diaphaniety:

Semitransparent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4.5-5 - Near Apatite

Luster:

Resinous

Streak:

yellowish brown

Optical Properties of Sobolevite

Gladstone-Dale:

CI meas= 0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2263,KPDmeas= 0.2204,KC= 0.2293

Optical Data:

Biaxial (-), a=1.627, b=1.686, g=1.69, bire=0.0630, 2V(Calc)=28, 2V(Meas)=25-33. Dispersion r < v strong.

Pleochroism (x):

nearly colorless.

Pleochroism (y):

yellowish brown.

Pleochroism (z):

yellowish brown.

Calculated Properties of Sobolevite

Electron Density:

r_electron=2.87 gm/cc
note: r_Sobolevite=2.95 gm/cc.

Fermion Index

Fermion Index = 0.01661
Boson Index = 0.98339

Photoelectric:

PE_Sobolevite= 9.06 barns/electron
U=PE_Sobolevite x r_electron= 25.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sobolevite is Not Radioactive

Sobolevite Classification

Dana Class:

56.4.1.4 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.4)with [Si2O7] with phosphate, water

(56.4.1)Lomonosovite group

56.4.1.1 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

56.4.1.2 Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

56.4.1.3 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

56.4.1.4 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

Strunz Class:

VIII/C.14-130 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.14 - Fresnoite - Belkovite series

VIII/C.14-20 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m

VIII/C.14-30 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

VIII/C.14-40 Murmanite Na3(Ti,Nb)4(Si2O7)2O4·4(H2O) P1 ? 1

VIII/C.14-50 Epistolite Na4Nb2Ti(Si2O7)2O2(OH)2·4(H2O) P1 1

VIII/C.14-70 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

VIII/C.14-80 Vuonnemite Na11Nb2TiSi4O12(PO4)2O5F2 P1 1

VIII/C.14-110 Bussenite! Na2(Ba,Sr)2(Fe,Mn)TiSi2O7(CO3)(OH)3F P1 1

VIII/C.14-120* Quadruphite-VII Na14CaMgTi4[Si2O7]2(PO4)4O4F2 P1 1

VIII/C.14-120 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

VIII/C.14-130 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

VIII/C.14-140* Polyphite-VII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

VIII/C.14-140 Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

Other Sobolevite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

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Sobolevite

Na11(Na,Ca)4(Mg,Mn)Ti++++4(Si4O12)(PO4)4O5F3
Dana No: 56.4.1.4 Strunz No: VIII/C.14-130
Locality:

Notes: