Bismutocolumbite Mineral Data

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.

Name Pronunciation:

Bismutocolumbite + Pronunciation

Synonym:

ICSD 74338

IMA1991-003

PDF 45-1372

Bismutocolumbite Image

Images:

Bismutocolumbite

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

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 - Dipyramidal H-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),

Physical Properties of Bismutocolumbite

Cleavage:

{001} Perfect

Color:

Black.

Density:

7.56

Diaphaneity:

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
Ncalc = 2.06 - 2.38

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:

Bulk Density (Electron Density)=6.39 gm/cc
note: Specific Gravity of Bismutocolumbite =7.56 gm/cc.

Fermion Index:

Fermion Index = 0.0000937271
Boson Index = 0.9999062729

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bismutocolumbite is Not Radioactive

Bismutocolumbite Classification

Dana Class:

08.01.06.04 (08)Multiple Oxides with Nb, Ta, and Ti

(08.01)where A BO4

(08.01.06)Stibiocolumbite Group

08.01.06.01 Stibiocolumbite SbNbO4 Pc21n mm2

08.01.06.02 Stibiotantalite SbTaO4 Pc21n mm2

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

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

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

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 - 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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Bismutocolumbite

Bi(Nb,Ta)O4
Dana No: 08.01.06.04 Strunz No: 04.DE.30
Locality:

Notes:

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