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Bismutocolumbite

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Danburitovaya pegmatite vein, Malkhan pegmatite field (Malchan), Krasnyi Chikoy, Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
© Knut Eldjarn

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Formula:
Bi(Nb,Ta)O
 
4
System:OrthorhombicColour:Black; brown in ...
Hardness:5½
Member of:Cervantite Group
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

IMA status:Approved
Strunz 8th edition ID:4/D.25-35
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:8.1.6.4

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

Type Locality:Danburitovaya pegmatite vein, Malkhan pegmatite field (Malchan), Krasnyi Chikoy, Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
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:
QuartzMicrolite GroupElbaiteDanburiteCassiterite

Physical Properties of Bismutocolumbite

Lustre:Sub-Metallic
Colour:Black; brown in transmitted light
Streak:Brown to pale yellow
Hardness (Mohs):5½
Tenacity:Brittle
Cleavage:Perfect
on {010}
Fracture:Conchoidal
Density (measured):7.17 g/cm3
Density (calculated):7.66 g/cm3

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:
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°
Maximum Birefringence:δ = 0.090

Chart 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)O
 
4
Essential elements:Bi, Nb, O
All elements listed in formula:Bi, Nb, O, Ta
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:
(Bi
 
0.99
Sb
 
0.01
)
 
=1.00
(Nb
 
0.79
Ta
 
0.21
)
 
=1.00
O
 
4
Common Impurities:Pb,Sb,Sn,Ti

Relationship of Bismutocolumbite to other Species

Member of:Cervantite Group
Other Members of Group:

- +
Bismutotantalite
Bi(Ta,Nb)O
 
4
Cervantite
Sb
3+
 
Sb
5+
 
O
 
4
Clinocervantite
Sb
3+
 
Sb
5+
 
O
 
4
Stibiocolumbite
Sb(Nb,Ta)O
 
4
Stibiotantalite
Sb(Ta,Nb)O
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
4.DE.05Downeyite
SeO
 
2
4.DE.10Koragoite
(Mn
2+
 
,Fe
3+
 
)
 
3
(Nb,Ta,Ti)
 
2
(Nb,Mn)
 
2
(W,Ta)
 
2
O
 
20
4.DE.15Koechlinite
Bi
 
2
MoO
 
6
4.DE.15Russellite
Bi
 
2
WO
 
6
4.DE.15Tungstibite
Sb
3+
2
WO
 
6
4.DE.20Tellurite
TeO
 
2
4.DE.25Paratellurite
TeO
 
2
4.DE.30Bismutotantalite
Bi(Ta,Nb)O
 
4
4.DE.30Cervantite
Sb
3+
 
Sb
5+
 
O
 
4
4.DE.30Stibiotantalite
Sb(Ta,Nb)O
 
4
4.DE.30Stibiocolumbite
Sb(Nb,Ta)O
 
4
4.DE.30Clinocervantite
Sb
3+
 
Sb
5+
 
O
 
4
4.DE.35Baddeleyite
ZrO
 
2

Other Names for Bismutocolumbite

Synonyms:
IMA1991-003
Other Languages:
German:Bismutocolumbit
Russian:Висмутоколумбит
Spanish:Bismutocolumbita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Bismutocolumbite details from Handbook of Mineralogy (PDF)
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    • Localities for Bismutocolumbite

    Hide Locality List
    (TL) indicates type locality. ? 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
            • Malkhan pegmatite field (Malchan)
    		[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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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