Sosedkoite Mineral Data

Sosedkoite Mineral Data +

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General Sosedkoite Information

Chemical Formula:

(K,Na)5Al2(Ta,Nb)22O60

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

Empirical Formula:

K_3.1Na_1.9Ca_0.1Al_1.9Ta_20.7NbSb_0.1O₆₀

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.

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Sosedkoite Crystallography

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pban

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

By Intensity(I/I_o): 3.95(1), 3.03(0.9), 1.974(0.6),

Physical Properties of Sosedkoite

Cleavage:

None

Color:

Colorless.

Density:

6.9

Diaphaniety:

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

Optical Properties of Sosedkoite

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

RL Anisotrophism:

Strong.

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

Electron Density:

r_electron=5.89 gm/cc
note: r_Sosedkoite=6.91 gm/cc.

Fermion Index

Fermion Index = 0.00018
Boson Index = 0.99982

Photoelectric:

PE_Sosedkoite= 903.89 barns/electron
U=PE_Sosedkoite x r_electron=5,322.88 barns/cc.

Radioactivity:

GRapi = 29.62 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Sosedkoite - barely detectable

Sosedkoite Classification

Dana Class:

8.7.6.2 (8)Multiple Oxides with Nb, Ta, and Ti

(8.7)Dana Type

(8.7.6)Dana Group

8.7.6.1 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m

8.7.6.2 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m

Strunz Class:

IV/D.27-50 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.27 - Bahianite - Sosedkoite series

IV/D.27-10 Bahianite Al5Sb3O14(OH)2 C 2/m 2/m

IV/D.27-20 Simpsonite Al4(Ta,Nb)3O13(OH) P 3 3

IV/D.27-30 Alumotantite AlTaO4 P bcn 2/m 2/m 2/m

IV/D.27-40 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m

IV/D.27-50 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m

Other Sosedkoite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Sosedkoite

(K,Na)5Al2(Ta,Nb)22O60
Dana No: 8.7.6.2 Strunz No: IV/D.27-50
Locality:

Notes: