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Columbite-(Mg)

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Formula:
(Mg,Fe,Mn)(Nb,Ta)2O6
System:
Orthorhombic
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
Member of:
This page provides mineralogical data about Columbite-(Mg).

Classification of Columbite-(Mg)

Approved
4.DB.35

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
8.3.2.5

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.1.48

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
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First Recorded Occurrence of Columbite-(Mg)

Year of Discovery:
1963

Physical Properties of Columbite-(Mg)

Sub-Metallic
Colour:
Black
Hardness (Mohs):

Crystallography of Columbite-(Mg)

Crystal System:
Orthorhombic
Cell Parameters:
a = 5.7Å, b = 14.19Å, c = 5.03Å
Ratio:
a:b:c = 0.402 : 1 : 0.354
Unit Cell Volume:
V 406.84 ų (Calculated from Unit Cell)

Optical Data of Columbite-(Mg)

Type:
Biaxial (+)
RI values:
nα = 2.330 - 2.360 nγ = 2.390 - 2.440
Max Birefringence:
δ = 0.060 - 0.080
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Columbite-(Mg)

Formula:
(Mg,Fe,Mn)(Nb,Ta)2O6
Essential elements:
All elements listed in formula:

Relationship of Columbite-(Mg) to other Species

Member of:
Other Members of Group:
Columbite-(Fe)FeNb2O6
Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10
Tantalite-(Fe)FeTa2O6
Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6
Tantalite-(Mn)MnTa2O6
4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6
4.DB.10OrdoñeziteZnSb2O6
4.DB.15bAkhtenskiteε-Mn4+O2
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2
4.DB.15aParamontroseiteV4+O2
4.DB.15aRamsdelliteMn4+O2
4.DB.20Scrutinyitealpha-PbO2
4.DB.25IshikawaiteU4+Fe2+Nb2O8
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
4.DB.25SrilankiteZrTi2O6
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8
4.DB.25Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
4.DB.30FerberiteFeWO4
4.DB.30HübneriteMnWO4
4.DB.30Sanmartinite(Zn,Fe)WO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HeftetjerniteScTaO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)FeNb2O6
4.DB.35Tantalite-(Fe)FeTa2O6
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
4.DB.35Tantalite-(Mn)MnTa2O6
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10
4.DB.35Magnocolumbite
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6
4.DB.40FerrowodginiteFeSnTa2O8
4.DB.40LithiotantiteLi(Ta,Nb)3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMnTiTa2O8
4.DB.40WodginiteMn(Sn,Ta)Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)
4.DB.50Carmichaelite(Ti,Cr,Fe)[O2-x(OH)x]
4.DB.55AlumotantiteAlTaO4
4.DB.60Biehlite((Sb,As)O)2[MoO4]
18.1.1LithiotantiteLi(Ta,Nb)3O8
18.1.2LueshiteNaNbO3
18.1.3NatroniobiteNaNbO3
18.1.4FranconiteNa2Nb4O11 · 9H2O
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
18.1.10RynersoniteCa(Ta,Nb)2O6
18.1.11Microlite Group
18.1.12BelyankiniteCa1-2(Ti,Nb)5O12 · 9H2O (?)
18.1.13Latrappite(Ca,Na)(Nb,Ti,Fe)O3
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)
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)
18.1.23Foordite(Sn,Pb)(Nb,Ta)2O6
18.1.24ChangbaiitePbNb2O6
18.1.25Plumbopyrochlore (of Skorobogatova et al.)
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
18.1.40WodginiteMn(Sn,Ta)Ta2O8
18.1.41Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
18.1.42Columbite-(Fe)FeNb2O6
18.1.43Tantalite-(Fe)FeTa2O6
18.1.44Columbite(Fe,Mn)(Nb,Ta)2O6
18.1.45Tantalite(Fe,Mn)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6
18.1.47Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

Other Names for Columbite-(Mg)

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 Columbite-(Mg)

Reference List:
American Mineralogist (1963): 48: 1182.

Mineralogical Abstracts (1969): 69: 582.

Internet Links for Columbite-(Mg)

Localities for Columbite-(Mg)

(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.
Italy
 
  • Tuscany
    • Livorno Province
      • Elba Island
        • Campo nell'Elba
          • San Piero in Campo
Adriano Perugini found
Adriano Perugini found
Madagascar
 
  • Mahajanga Province (Majunga)
    • Betsiboka Region
Listed in www.excaliburmineral.com- catalog of rare species
Romania
 
  • Sibiu Co.
    • Lotru-Cibin Mts
Androne, D.A.M., Buzgar, N., and Kasper, H.U. (2005): Proceedings of the Annual Scientific Session of The Geological Society of Romania, Rosia Montana, 20-21 May 2005, 16-26.
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Vishnevye Mts (Vishnyovye; Cherry)
Nedosekova, I.L. (2007): Geology of Ore Deposits 49(2), 129-146.
Tajikistan
 
  • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
    • Pamir Mts
      • Pyandzh River Valley
        • Kukh-i-Lal (Kukhilal; Kuhi-lal)
          • Gem spinel Deposit
[Nickel & Nichols, 1991 - "Mineral Reference Manual", p126]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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