Sosedkoite
A valid IMA mineral species
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Formula:
(K,Na)5Al2(Ta,Nb)22O60
Colour:
Colourless
Lustre:
Adamantine
Hardness:
6
Specific Gravity:
6.90 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after Alexander Fedorovich Sosedko (Александр Федорович Соседко) (12 September 1901 - 1957), mineralogist, Institute of Geological Sciences, Academy of Sciences of the USSR (Moscow). He was a specialist in granite pegmatites.
Type Locality:
This page provides mineralogical data about Sosedkoite.
Unique Identifiers
Mindat ID:
3717
Long-form identifier:
mindat:1:1:3717:0
GUID
(UUID V4):
(UUID V4):
711cb517-c7d9-4479-9707-e218cbfe113e
IMA Classification of Sosedkoite
Approved
IMA Formula:
K5Al2Ta22O60
Approval year:
1981
First published:
1982
Classification of Sosedkoite
4.DM.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
M : With large (+- medium-sized) cations; unclassified
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
M : With large (+- medium-sized) cations; unclassified
8.7.6.2
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
18.1.20
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Sos | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Sosedkoite
Adamantine
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
6 on Mohs scale
Hardness:
VHN20=800 - 860 kg/mm2 - Vickers
Cleavage:
None Observed
Density:
6.90 g/cm3 (Calculated)
Optical Data of Sosedkoite
Type:
Biaxial
Anisotropism:
Strong
Bireflectance:
Strong
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
486nm | 13.5% | 12.8% |
551nm | 12.8% | 12.0% |
589nm | 13.3% | 12.3% |
656nm | 11.3% | 11.3% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 13.5%.
R1 shown in black, R2 shown in red
Chemistry of Sosedkoite
Mindat Formula:
(K,Na)5Al2(Ta,Nb)22O60
Common Impurities:
Sb
Crystallography of Sosedkoite
Crystal System:
Orthorhombic
Cell Parameters:
a = 17.25(3) Å, b = 17.73(3) Å, c = 3.95(2) Å
Ratio:
a:b:c = 0.973 : 1 : 0.223
Unit Cell V:
1,208.08 ų (Calculated from Unit Cell)
Z:
1
Comment:
Point Group: n.d.; Space Group: n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.95 Å | (100) |
3.03 Å | (90) |
1.974 Å | (60) |
6.1 Å | (50) |
3.47 Å | (50) |
2.79 Å | (50) |
2.376 Å | (50) |
Comments:
Vasin-Myl'k Mt, Murmansk Oblast, Russia. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Sosedkoite
General Appearance of Type Material:
Acicular crystals up to 0.1 mm long in microlite and in hydroxykenomicrolite (cesstibtantite) and along grain boundaries of those minerals.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia, 5518.
Mining Museum, St. Petersburg, Russia, 2099/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Mining Museum, St. Petersburg, Russia, 2099/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
Granite pegmatite
Associated Minerals at Type Locality:
Reference:
Voloshin, A.V., Mel’nikov, Y.P., Pakhomovskii, Ya.A. (1982) Sosedkoite, (K,Na)5Al2(Ta,Nb,Sb)22O60, a new mineral from granite pegmatites. Doklady Akademii Nauk SSSR: 264: 442-445.
Synonyms of Sosedkoite
Other Language Names for Sosedkoite
German:Sosedkoit
Spanish:Sosedkoita
Related Minerals - Strunz-mindat Grouping
4.DM. | Bahariyaite | KMnO4 |
4.DM.05 | Rankamaite | (Na,K)3(Ta,Nb,Al)11(O,OH)31 |
4.DM.15 | Cesplumtantite | (Cs,Na)2(Pb,Sb3+)3Ta8O24 |
4.DM.20 | Eyselite | Fe3+Ge4+3O7(OH) |
4.DM.25 | Kuranakhite | PbMn4+Te6+O6 |
4.DM.30 | Gelosaite | BiMo6+(2-5x)Mo5+6xO7(OH) · H2O |
4.DM.30 | Mambertiite | BiMo5+2.80O8(OH) |
4.DM.35 | Ekebergite | ThFeNb2O8 |
4.DM.45 | Riesite | TiO2 |
4.DM.50 | Sardignaite | BiMo2O7(OH) · 2H2O |
4.DM.55 | Tewite | (K1.5◻0.5)(Te1.25W0.25◻0.5)W5O19 |
4.DM.60 | Wumuite | KAl0.33W2.67O9 |
4.DM.60 | Kingsgateite | ZrMo6+2O7(OH)2 · 2H2O |
Other Information
Notes:
Faint blue cathodoluminescence.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Sosedkoite
mindat.org URL:
https://www.mindat.org/min-3717.html
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References for Sosedkoite
Reference List:
Localities for Sosedkoite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Voloshin et al. (1982) +2 other references |
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