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Belyankinite

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Formula:
Ca1-2(Ti,Nb)5O12 · 9H2O (?)
System:
Amorphous
Colour:
White, light yellow to ...
Lustre:
Vitreous, Greasy, Pearly
Hardness:
2 - 3
Name:
For Dmitry Stepanovich Belyankin (1876-1953), prominent Russian mineralogist and petrographer.
A mineral of questionable status. Some authors suggest that belyankinite is just a mixture of minerals (mostly anatase) which forms as a common alteration product of murmanite or lomonosovite (Yakovenchuk et. al. Khibiny. Laplandia Minerals, Apatity, 2005, 466 p.)


Classification of Belyankinite

Approved, 'Grandfathered' (first described prior to 1959), Questionable
4.FM.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
M : Hydroxides with H2O +- (OH); unclassified
8.7.8.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
18.1.12

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U

Physical Properties of Belyankinite

Vitreous, Greasy, Pearly
Diaphaneity (Transparency):
Opaque
Colour:
White, light yellow to brownish-yellow; black when manganese-rich
Hardness (Mohs):
2 - 3
Tenacity:
Brittle
Cleavage:
Perfect
in one direction, parallel to the plates
Fracture:
Irregular/Uneven
Density:
2.32 - 2.4 g/cm3 (Measured)    

Optical Data of Belyankinite

Type:
Biaxial (-)
RI values:
nα = 1.740 nβ = 1.772 - 1.778 nγ = 1.775 - 1.780
2V:
Measured: 21° to 25°
Max Birefringence:
δ = 0.035 - 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v, moderate
Pleochroism:
Visible
Comments:
X = brown to dark brown, Y = light brown to yellow-brown, Z = light brown; Orientation: X = a, Y = b, Z = c

Chemical Properties of Belyankinite

Formula:
Ca1-2(Ti,Nb)5O12 · 9H2O (?)
IMA Formula:
Ca1-2(Ti,Zr,Nb)5O12 · 9H2O
Elements listed in formula:
Analytical Data:
Chemical analysis of material from Kola Peninsula, Russia
(Nb,Ta)2O5  (7.16)
SiO2        (3.96)
TiO2       (48.76)
ZrO2        (6.64)
Al2O3       (0.46)
CaO         (6.72)
Na2O        (0.55)
H2O+        (8.35)
H2O-       (17.21)

sum         99.81 wt.-%

Crystallography of Belyankinite

Crystal System:
Amorphous
Morphology:
In platy aggregates or massive, to 20 cm
X-Ray Powder Diffraction Data:
d-spacingIntensity
1.690 (10)
3.21 (8)
2.48 (6)
1.361 (5)
2.90 (3)
2.18 (3)
1.633 (2)
Comments:
Recorded on type material, after heating to 900 °C

Type Occurrence of Belyankinite

Geological Setting of Type Material:
In nepheline syenite in an alkalic massif, included in aegirine and microcline
Empirical Formula:
Al,Fe,K,Mn,Mg,Na,Si,Ta

Relationship of Belyankinite to other Species

Series:
Forms a series with Manganbelyankinite (see here)
4.FM.15FranconiteNa(Nb2O5)(OH) · 3H2O
4.FM.15Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O
4.FM.15Ternovite(Mg,Ca)Nb4O11 · nH2O
4.FM.25Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
4.FM.25Manganbelyankinite(Mn,Ca)(Ti,Nb)5O12 · 9H2O
4.FM.30Silhydrite3SiO2 · H2O
4.FM.35CuzticiteFe23+(TeO6) · 3H2O
18.1.1LithiotantiteLiTa3O8
18.1.2LueshiteNaNbO3
18.1.3NatroniobiteNaNbO3
18.1.4FranconiteNa(Nb2O5)(OH) · 3H2O
18.1.5NatrotantiteNa2Ta4O11
18.1.6IrtyshiteNa2(Ta,Nb)4O11
18.1.7Rankamaite(Na,K)3(Ta,Nb,Al)11(O,OH)31
18.1.8Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)
18.1.9CalciotantiteCaTa4O11
18.1.10RynersoniteCaTa2O6
18.1.11Microlite Group
18.1.13LatrappiteCa2NbFe3+O6
18.1.14Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O
18.1.15Bariomicrolite (of Hogarth 1977)
18.1.16ParabariomicroliteBaTa4O10(OH)2 · 2H2O
18.1.17Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.1.18AlumotantiteAlTaO4
18.1.19SimpsoniteAl4(Ta,Nb)3O13(OH,F)
18.1.20Sosedkoite(K,Na)5Al2(Ta,Nb)22O60
18.1.21Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6
18.1.22Stannomicrolite (of Hogarth 1977)
18.1.23FoorditeSn2+(Nb,Ta)2O6
18.1.24ChangbaiitePbNb2O6
18.1.25Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
18.1.26Plumbomicrolite (of Hogarth 1977)
18.1.27StibiocolumbiteSb(Nb,Ta)O4
18.1.28StibiotantaliteSb(Ta,Nb)O4
18.1.29Natrobistantite
18.1.30Cesplumtantite(Cs,Na)2(Pb,Sb3+)3Ta8O24
18.1.31Stibiomicrolite (of Groat et al.)
18.1.32Cesstibtantite
18.1.34BismutotantaliteBi(Ta,Nb)O4
18.1.35Bismutomicrolite (of Hogarth 1977)
18.1.36Tantalite-(Mn)MnTa2O6
18.1.37Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
18.1.38Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6
18.1.39Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
18.1.40WodginiteMn2+Sn4+Ta2O8
18.1.41Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
18.1.42Columbite-(Fe)FeNb2O6
18.1.43Tantalite-(Fe)FeTa2O6
18.1.44Columbite
18.1.45Tantalite(Mn,Fe)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6
18.1.47Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6
18.1.48Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

Other Names for Belyankinite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Belyankinite

Reference List:
Gerasimovskii, V. I. and Kazakova, M. E. (1950): Belyankinite - a new mineral. Doklady Akademii Nauk SSSR 71, 925-927 (in Russian). - American Mineralogist (1952), 37, 882 (abstract).

Semenov, E. I. (1957): Oxides and hydroxides of titanium and niobium in the Lovozero alkalic massif. Inst. mineral., geokhim., and crystallokhim. redkikh elementov, Trudy 1, 41-59 (in Russian). - American Mineralogist (1958), 43, 1220-1221 (abstract).

Vlasov, K. A., Kuz'menko, M. V. and Es'kova, E. M. (1966): The Lovozero alkali massif. Akad. Nauk SSSR, 390-392 (in English).

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 51.

Internet Links for Belyankinite

mindat.org URL:
https://www.mindat.org/min-619.html
Please feel free to link to this page.

Localities for Belyankinite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Egypt
 
  • Red Sea Governorate
    • Eastern Desert
Gehad M. Saleh (2007) Rare-Metal Pegmatites from the Southeastern Desert, Egypt: Geology, Geochemistry, and Petrogenesis. International Geology Review Vol. 49:824-843.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
www.koeln.netsurf.de/~w.steffens/khib.htm; Mitchell, R. H., & Chakhmouradian, A. R. (1998). Th-rich loparite from the Khibina alkaline complex, Kola Peninsula: isomorphism and paragenesis. Mineralogical Magazine, 62(3), 341-353.
        • Lovozero Massif
Pavel Kartashov (2016)
Pekov, I.V. (2000): Lovozero Massif: History, Pegmatites, Minerals. Ocean Pictures LTD, Russia. 480p
[World of Stones 95:5-6, p64]
          • Tyul'bnyunuai River Valley
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; American Mineralogist 37:802
Mineral and/or Locality  
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