Sobolevite Mineral Data

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.

Name Pronunciation:

Sobolevite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.68 - 1.69

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:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Sobolevite =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Sobolevite= 9.06 barns/electron
U=PE_Sobolevite x rElectron Density= 25.97 barns/cc.

Radioactivity:

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

Sobolevite Classification

Dana Class:

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

(56.04)with [Si2O7] with phosphate, water

(56.04.01)Lomonosovite group

56.04.01.01 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

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

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

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

Strunz Class:

09.BE.37 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.37 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

Other Sobolevite Information

References:

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

See Also:

Links to other databases for Sobolevite :
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

Search for Sobolevite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Sobolevite :

A Bijoux Google Search for Sobolevite
Adam's Minerals Google Search for Sobolevite
Cape Minerals Google Search for Sobolevite
Dakota Matrix Minerals Google Search for Sobolevite
Excalibur Mineral Corp. Google Search for Sobolevite
Exceptional Minerals Google Search for Sobolevite
John Betts Fine Minerals Search for Sobolevite
McDougall Minerals Google Search for Sobolevite
Mineral News Website Link
Rock and Mineral Shows Google Search for Sobolevite
Weinrich Minerals, Inc. Google Search for Sobolevite

Ask about Sobolevite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Sobolevite Specimen Label here :

Sobolevite

Na11(Na,Ca)4(Mg,Mn)Ti++++4(Si4O12)(PO4)4O5F3
Dana No: 56.04.01.04 Strunz No: 09.BE.37
Locality:

Notes: