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Sosedkoite Mineral Data
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General Sosedkoite Information
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 Chemical Formula: |
(K,Na)5Al2(Ta,Nb)22O60 |
| Composition: |
Molecular Weight = 5,030.82 gm |
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Potassium 2.41 % K 2.90 % K2O |
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Sodium 0.87 % Na 1.17 % Na2O |
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Calcium 0.08 % Ca 0.11 % CaO |
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Tantalum 74.45 % Ta 90.91 % Ta2O5 |
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Niobium 1.85 % Nb 2.64 % Nb2O5 |
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Aluminum 1.02 % Al 1.93 % Al2O3 |
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Antimony 0.24 % Sb 0.29 % Sb2O3 |
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Oxygen 19.08 % O |
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______ ______ |
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100.00 % 99.95 % = TOTAL OXIDE |
| Empirical Formula: |
K3.1Na1.9Ca0.1Al1.9Ta20.7NbSb0.1O60 |
| Environment: |
Granite pegmatites. |
| IMA Status: |
Approved IMA 1982 |
| Locality: |
Kola Peninsula, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for A. F. Sosedko (1901-1957), Russian mineralogist. |
| Name Pronunciation: |
Sosedkoite + Pronunciation  |
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Sosedkoite Crystallography
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| Axial Ratios: |
a:b:c =0.9729:1:0.2227 |
| Cell Dimensions: |
a = 17.25, b = 17.73, c = 3.95, Z = 1; V = 1,208.08 Den(Calc)= 6.91 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pban |
| X Ray Diffraction: |
By Intensity(I/Io): 3.95(1), 3.03(0.9), 1.974(0.6), |
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Physical Properties of Sosedkoite
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| Cleavage: |
None |
| Color: |
Colorless. |
| Density: |
6.9 |
| Diaphaneity: |
Transparent |
| Habit: |
Acicular - Occurs as needle-like crystals. |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Hardness: |
6 - Orthoclase |
| Luminescence: |
Cathodolumiescence. |
| Luster: |
Adamantine |
| Streak: |
white |
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Optical Properties of Sosedkoite
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| Optical Data: |
Biaxial (?) |
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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
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| RL Anisotrophism: |
Strong. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Sosedkoite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 486 nm |
13.50 |
12.60 |
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| 551 nm |
12.80 |
12.00 |
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| 589 nm |
13.30 |
12.30 |
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| 656 nm |
11.30 |
11.30 |
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Calculated Relative Intensity Colors of Sosedkoite in Air
Relative
Intensity |
0% |
80% |
100% |
160% |
240% |
320% |
400% |
480% |
560% |
640% |
720% |
740% |
| R1 |
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| R2 |
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Calculated Properties of Sosedkoite
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| Electron Density: |
Bulk Density (Electron Density)=5.89 gm/cc
note: Specific Gravity of Sosedkoite =6.91 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0001849026
Boson Index = 0.9998150974 |
| Photoelectric: |
PESosedkoite = 903.89 barns/electron
U=PESosedkoite x relectron=5,322.88 barns/cc.
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| Radioactivity: |
GRapi = 29.63 (Gamma Ray American Petroleum Institute Units)
Concentration of Sosedkoite per GRapi unit = 3.38 (%)
Estimated Radioactivity from Sosedkoite  - barely detectable
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Sosedkoite Classification
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| Dana Class: |
08.07.06.02 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.07)Dana Type |
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(08.07.06)Dana Group |
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08.07.06.01 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m |
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08.07.06.02 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m |
| Strunz Class: |
04.DM.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DM -With large (� medium-sized) cations; unclassified |
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04.DM.05 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m |
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04.DM.05 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m |
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Other Sosedkoite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| 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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Sosedkoite
(K,Na)5Al2(Ta,Nb)22O60
Dana No: 08.07.06.02 Strunz No: 04.DM.05
Locality:
Notes:
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