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Bismutocolumbite

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Formula:
Bi(Nb,Ta)O4
System:
Orthorhombic
Colour:
Black; brown in ...
Hardness:
Name:
For the bismuth in its composition and its relation to the minerals of the columbite-tantalite series.
This page provides mineralogical data about Bismutocolumbite.

Classification of Bismutocolumbite

Approved
4.DE.30

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
8.1.6.4

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
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Type Occurrence of Bismutocolumbite

General Appearance of Type Material:
Prismatic crystals to 2 mm, striated parallel to their elongation
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
In a pegmatite
Associated Minerals at Type Locality:

Physical Properties of Bismutocolumbite

Sub-Metallic
Colour:
Black; brown in transmitted light
Streak:
Brown to pale yellow
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
on {010}
Fracture:
Conchoidal
Density:
7.17 g/cm3 (Measured)    7.66 g/cm3 (Calculated)

Crystallography of Bismutocolumbite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 4.992Å, b = 5.677Å, c = 11.731Å
Ratio:
a:b:c = 0.879 : 1 : 2.066
Unit Cell Volume:
V 332.45 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.164 (100)
2.934 (90)
1.734 (80)
2.842 (45)
2.495 (45)
1.769 (45)
1.899 (40)
Comments:
Recorded on type material

Optical Data of Bismutocolumbite

Type:
Biaxial (+)
RI values:
nα = 2.380 nβ = 2.420 nγ = 2.470
2V:
Calculated: 85°
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
Relatively strong

Chemical Properties of Bismutocolumbite

Formula:
Bi(Nb,Ta)O4
Essential elements:
All elements listed in formula:
Analytical Data:
Electron microprobe analysis of type material
Nb2O5  (27.03)
Ta2O5  (11.67)
TiO2    (0.06)
SnO2    (0.08)
Bi2O3  (59.85)
Sb2O3   (0.28)
PbO     (0.13)

sum     99.10 wt.-%
Empirical Formula:
(Bi0.99Sb0.01)=1.00(Nb0.79Ta0.21)=1.00O4
Common Impurities:
Pb,Sb,Sn,Ti

Relationship of Bismutocolumbite to other Species

Other Members of Group:
BismutotantaliteBi(Ta,Nb)O4
CervantiteSb3+Sb5+O4
ClinocervantiteSb3+Sb5+O4
StibiocolumbiteSb(Nb,Ta)O4
StibiotantaliteSb(Ta,Nb)O4
4.DE.05DowneyiteSeO2
4.DE.10Koragoite(Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20
4.DE.15KoechliniteBi2MoO6
4.DE.15RusselliteBi2WO6
4.DE.15TungstibiteSb23+WO6
4.DE.20TelluriteTeO2
4.DE.25ParatelluriteTeO2
4.DE.30BismutotantaliteBi(Ta,Nb)O4
4.DE.30CervantiteSb3+Sb5+O4
4.DE.30StibiotantaliteSb(Ta,Nb)O4
4.DE.30StibiocolumbiteSb(Nb,Ta)O4
4.DE.30ClinocervantiteSb3+Sb5+O4
4.DE.35BaddeleyiteZrO2

Other Names for Bismutocolumbite

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 Bismutocolumbite

Reference List:
Peretazhko, I. S., Zagorskiy, V. E., Sapozhnikov, A. N., Bobrov, Y. D. and Rakcheev, A. D. (1992) Bismutocolumbite Bi(Nb,Ta)O4 - a new mineral from miarolitic pegmatites. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 121(3), 130-134 (in Russian). - Mineralogical Abstracts (1994), 45, 111 (abstract). - American Mineralogist (1994), 79, 570 (abstract).

Anthony, J. W. et al. (1997) Handbook of Mineralogy, Vol. 3, 62.

Zubkova, N. V., Puscharovsky, D. Y., Giester, G., Smolin, A. S., Tillmanns, E., Brandstätter, F., Hammer, V., Peretazhko, I. S., Sapozhnikov, A. N. and Kashaev, A. A. (2002) Bismutocolumbite, Bi(Nb0.79Ta0.21)O4, stibiocolumbite, Sb(Nb0.67Ta0.33)O4, and their structural relation to the other ABO4 minerals with stibiotantalite (SbTaO4) structure. Neues Jahrbuch für Mineralogie, Monatshefte, 145-159.

Internet Links for Bismutocolumbite

Localities for Bismutocolumbite

(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
 
  • Lombardy
    • Brescia Province
      • Adamello-Brenta Natural Park
        • Adamello Massif
          • Mt. Foppa
Pezzotta, Federico and Guastoni, Alessandro, The New Discovery of a LCT Pegmatite in the Adamello Massif, Central Southern Alps, Italy; Museo Civico di Storia Naturale, Milan, Italy.
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Chitinskaya Oblast'
        • Krasnyi Chikoy
Fialova, D., Kremplova, M., Hynek, D., Konecna, M., Kaiser, J., Malina, R., ... & Adam, V. (2013). Sosedka Pegmatite Metal Ions Composition Determined by Voltammetry. Int. J. Electrochem. Sci, 8, 7853-7867.
[Lapis 1993:1 p13-15; ZVMO,(1992) 121, n3, 130-134]; 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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