Bismutocolumbite Mineral Data

Bismutocolumbite Mineral Data +

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General Bismutocolumbite Information

Chemical Formula:

Bi(Nb,Ta)O4

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

Empirical Formula:

BiNb_0.75Ta_0.25O₄

Environment:

In a pegmatite.

IMA Status:

Approved IMA 1992

Locality:

In the Danburitovaya mine, Malkhan Range, central Transbaikal, Russia. Link to MinDat.org Location Data.

Name Origin:

For BISMuth in its composition and relation to minerals of the "columbite-tantalite" series.

Synonym:

ICSD 74338

IMA1991-003

PDF 45-1372

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Bismutocolumbite Crystallography

Axial Ratios:

a:b:c =0.4255:1:0.4839

Cell Dimensions:

a = 4.992, b = 11.731, c = 5.677, Z = 3; V = 332.45 Den(Calc)= 5.81

Crystal System:

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

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

By Intensity(I/I_o): 3.164(1), 2.934(0.9), 1.734(0.8),

Crystal Structure:

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Zubkova N V , Pushcharovsky D Y , Giester G , Smolin A S , Tillmanns E , Brandstatter F , Hammer V , Peretyazhko I S , Sapozhnikov A N , Kashaev A A , Neues Jahrbuch fur Mineralogie, Monatshefte , 2002 (2002) p.145-159, Bismutocolumbite, Bi(Nb.79Ta.21)O4, stibiocolumbite, Sb(Nb.67Ta.33)O4 and their, structural relation to the other ABO4 minerals with, stibiotantalite (SbTaO4) structure, Locality: Malkhan field, Central Transbaikalia, Russia

Physical Properties of Bismutocolumbite

Cleavage:

[001] Perfect

Color:

Black.

Density:

7.56

Diaphaniety:

Subtranslucent to Opaque

Hardness:

5.5 - Knife Blade

Luster:

Sub Metallic

Streak:

yellowish brown

Optical Properties of Bismutocolumbite

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

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

Electron Density:

r_electron=6.39 gm/cc
note: r_{Bismutocolumbite}=7.56 gm/cc.

Fermion Index

Fermion Index = 0.00009
Boson Index = 0.99991

Photoelectric:

PE_{Bismutocolumbite}=1,197.40 barns/electron
U=PE_{Bismutocolumbite} x r_electron=7,654.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bismutocolumbite is Not Radioactive

Bismutocolumbite Classification

Dana Class:

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

(8.1)where A BO4

(8.1.6)Dana Group

8.1.6.1 Stibiocolumbite SbNbO4 Pc21n mm2

8.1.6.2 Stibiotantalite SbTaO4 Pc21n mm2

8.1.6.3 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m

8.1.6.4 Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m

Strunz Class:

IV/D.25-35 IV - Oxides

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

IV/D.25 - Cervantite - Chiluite series

IV/D.25-05 Clinocervantite! SbSbO4 C 2/c 2/m

IV/D.25-10 Cervantite SbSbO4 Pbn21 mm2

IV/D.25-20 Stibiocolumbite SbNbO4 Pc21n mm2

IV/D.25-30 Stibiotantalite SbTaO4 Pc21n mm2

IV/D.25-35 Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m

IV/D.25-40 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m

IV/D.25-70 Chiluite Bi6Te2Mo2O21 P 6₃22, P 6₃/m, P 6₃ Hex

Other Bismutocolumbite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

See Also:

Links to other databases for Bismutocolumbite :
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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Print or Cut-and-Paste your Bismutocolumbite Specimen Label here :

Bismutocolumbite

Bi(Nb,Ta)O4
Dana No: 8.1.6.4 Strunz No: IV/D.25-35
Locality:

Notes: