Mineralogy Database

Sosedkoite Mineral Data

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General Sosedkoite Information

Help on Chemical  Formula: Chemical Formula: (K,Na)5Al2(Ta,Nb)22O60
Help on Composition: Composition: Molecular Weight = 5,030.82 gm
   Potassium   2.41 %  K     2.90 % K2O
   Sodium      0.87 %  Na    1.17 % Na2O
   Calcium     0.08 %  Ca    0.11 % CaO
   Tantalum   74.45 %  Ta   90.91 % Ta2O5
   Niobium     1.85 %  Nb    2.64 % Nb2O5
   Aluminum    1.02 %  Al    1.93 % Al2O3
   Antimony    0.24 %  Sb    0.29 % Sb2O3
   Oxygen     19.08 %  O
             ______        ______ 
             100.00 %       99.95 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K3.1Na1.9Ca0.1Al1.9Ta20.7NbSb0.1O60
Help on Environment: Environment: Granite pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for A. F. Sosedko (1901-1957), Russian mineralogist.
Help on Name Pronunciation: Name Pronunciation: Sosedkoite + Pronunciation Say SOSEDKOITE
 

Sosedkoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9729:1:0.2227
Help on Cell Dimensions: Cell Dimensions: a = 17.25, b = 17.73, c = 3.95, Z = 1; V = 1,208.08 Den(Calc)= 6.91
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pban
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.95(1), 3.03(0.9), 1.974(0.6),
 

Physical Properties of Sosedkoite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 6.9
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Cathodolumiescence.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Sosedkoite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.09 - from Gladstone-Dale relationship (KC = 0.1571) where Ncalc=Dcalc*KC+1
NCalc= 2.08 - from Gladstone-Dale relationship (KC = 0.1571) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Sosedkoite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 486 nm   13.50   12.60 
   
 551 nm   12.80   12.00 
 589 nm   13.30   12.30 
 656 nm   11.30   11.30 
Calculated Relative Intensity Colors of Sosedkoite in Air
Relative
Intensity
   0%   80% 100% 160% 240% 320% 400% 480% 560% 640% 720% 740%
R1                        
R2                        
 

Calculated Properties of Sosedkoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.89 gm/cc
note: Specific Gravity of Sosedkoite =6.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001849026
Boson Index = 0.9998150974
Help on Photoelectric: Photoelectric: PESosedkoite = 903.89 barns/electron
U=PESosedkoite x relectron=5,322.88 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 29.63 (Gamma Ray American Petroleum Institute Units)
Concentration of Sosedkoite per GRapi unit = 3.38 (%)

Estimated Radioactivity from Sosedkoite - barely detectable

 

Sosedkoite Classification

Help on  Dana Class: Dana Class: 08.07.06.02 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.07)Dana Type
  (08.07.06)Dana Group
 
08.07.06.01 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m
 
08.07.06.02 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DM.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DM -With large (� medium-sized) cations; unclassified
 
04.DM.05 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m
 
04.DM.05 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m
 

Other Sosedkoite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Sosedkoite :
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

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

Sosedkoite

(K,Na)5Al2(Ta,Nb)22O60
Dana No: 08.07.06.02 Strunz No: 04.DM.05
Locality:

 

Notes:

 

 
   
 


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