Sobolevite Mineral Data

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.

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

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)

Search for Sobolevite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Sobolevite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Sobolevite Mineral Data :

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: 56.4.1.4 Strunz No: VIII/C.14-130
Locality:

Notes: