Mineralogy Database

Bismutocolumbite Mineral Data

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General Bismutocolumbite Information

Help on Chemical  Formula: Chemical Formula: Bi(Nb,Ta)O4
Help on Composition: Composition: Molecular Weight = 387.89 gm
   Tantalum  11.66 %  Ta   14.24 % Ta2O5
   Niobium   17.96 %  Nb   25.70 % Nb2O5
   Bismuth   53.88 %  Bi   60.06 % Bi2O3
   Oxygen    16.50 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BiNb0.75Ta0.25O4
Help on Environment: Environment: In a pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: In the Danburitovaya mine, Malkhan Range, central Transbaikal, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For BISMuth in its composition and relation to minerals of the "columbite-tantalite" series.
Help on Name Pronunciation: Name Pronunciation: Bismutocolumbite + Pronunciation Say BISMUTOCOLUMBITE
Help on Synonym: Synonym: ICSD 74338
  PDF 45-1372

Bismutocolumbite Image

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Comments: Black crystals of bismutocolumbite.
Location: Malkhan, Krasny Chikoy, Transbaikalia, Siberia. Scale: Picture Size 5 mm.
© Thomas Witzke

Bismutocolumbite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4255:1:0.4839
Help on Cell Dimensions: Cell Dimensions: a = 4.992, b = 11.731, c = 5.677, Z = 3; V = 332.45 Den(Calc)= 5.81
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcnn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.164(1), 2.934(0.9), 1.734(0.8),

Physical Properties of Bismutocolumbite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Black.
Help on Density: Density: 7.56
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: yellowish brown

Optical Properties of Bismutocolumbite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.344 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.245,KPDmeas= 0.1883,KC= 0.1823
Ncalc = 2.06 - 2.38
Help on Optical Data: Optical Data: Biaxial (+), a=2.38, b=2.42, g=2.47, bire=0.0900, 2V(Calc)=86, 2V(Meas)=85.

Calculated Properties of Bismutocolumbite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.39 gm/cc
note: Specific Gravity of Bismutocolumbite =7.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0000937271
Boson Index = 0.9999062729
Help on Photoelectric: Photoelectric: PEBismutocolumbite =1,197.40 barns/electron
U=PEBismutocolumbite x rElectron Density=7,654.56 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bismutocolumbite is Not Radioactive

Bismutocolumbite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.06)Stibiocolumbite Group Stibiocolumbite SbNbO4 Pc21n mm2 Stibiotantalite SbTaO4 Pc21n mm2 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DE.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DE -With medium-sized cations; with various polyhedra
04.DE.30 Cervantite SbSbO4 Pbn21 mm2
04.DE.30 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m
04.DE.30 Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m
04.DE.30 Clinocervantite! SbSbO4 C 2/c 2/m
04.DE.30 Stibiocolumbite SbNbO4 Pc21n mm2
04.DE.30 Stibiotantalite SbTaO4 Pc21n mm2

Other Bismutocolumbite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)
Help on See Also: See Also: Links to other databases for Bismutocolumbite :
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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Dana No: Strunz No: 04.DE.30





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