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Bismutocolumbite

Big Photo

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

Show Bismutocolumbite Photos (3)
Formula:
Bi(Nb,Ta)O
 
4
System:OrthorhombicColour:Black; brown in ...
Hardness:5½
Name:For bismuth in its composition and 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), Krasny 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:
QuartzMicroliteElbaiteDanburiteCassiterite

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)
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
Analyical 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

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
(BiO)
 
2
[MoO
 
4
]
4.DE.15Russellite
(BiO)
 
2
[WO
 
4
]
4.DE.15Tungstibite
Sb
 
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.

Articles/Blogs about Bismutocolumbite

Internet Links for Bismutocolumbite

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    Localities for Bismutocolumbite

    (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'
          • Krasny Chikoy
            • Malkhan pegmatite field (Malchan)
    		[Lapis 1993:1 p13-15; ZVMO,(1992) 121, n3, 130-134]
    Mineral and/or Locality
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