Bismutotantalite Mineral Data

Bismutotantalite Mineral Data +

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General Bismutotantalite Information

Chemical Formula:

Bi(Ta,Nb)O4

Composition:

Molecular Weight = 436.32 gm

Tantalum 33.18 % Ta 40.51 % Ta₂O₅

Niobium 4.26 % Nb 6.09 % Nb₂O₅

Bismuth 47.90 % Bi 53.40 % Bi₂O₃

Oxygen 14.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BiTa_0.8Nb_0.2O₄

Environment:

In a pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1929

Locality:

Gamba Hill, Busiro Co., Uganda. Link to MinDat.org Location Data.

Name Origin:

Named for its composition (Bi, Ta).

Bismutotantalite Image

Images:

Bismutotantalite

Comments: Tan coatings of bismutotantalite on white feldspar with pink lepidolite.
Location: Harding Mine, Taos County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bismutotantalite Crystallography

Axial Ratios:

a:b:c =0.4788:1:0.4214

Cell Dimensions:

a = 5.633, b = 11.763, c = 4.957, Z = 4; V = 328.46 Den(Calc)= 8.82

Crystal System:

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

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

By Intensity(I/I_o): 3.148(1), 2.945(0.6), 3.555(0.3),

Forms:

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Forms: [ 1 3 0] [ 0 1 0] [ 1 1 1] [ 1 0 1] [ 1 1 0]

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Crystal Structure:

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Galliski M A , Marquez-Zavalia M F , Cooper M A , Cerny P , Hawthorne F C , The Canadian Mineralogist , 39 (2001) p.103-110, Bismutotantalite from northwestern Argentina: Description and, crystal structure, Sample: [Bi] phase, Locality: northwestern Argentina

View Additional jPOWD Structure files for Bismutotantalite
[1]

Physical Properties of Bismutotantalite

Cleavage:

[010] Perfect, [101] Distinct

Color:

Light brown, Black.

Density:

8.51 - 8.84, Average = 8.67

Diaphaniety:

Subtranslucent to Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luster:

Adamantine - Metallic

Streak:

yellowish brown

Optical Properties of Bismutotantalite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1594,KPDmeas= 0.1621,KC= 0.1592

Optical Data:

Biaxial (+), a=2.388, b=2.403, g=2.428, bire=0.0400, 2V(Calc)=78, 2V(Meas)=80. Dispersion r < v.

Calculated Properties of Bismutotantalite

Electron Density:

r_electron=7.34 gm/cc
note: r_{Bismutotantalite}=8.82 gm/cc.

Fermion Index

Fermion Index = 0.00011
Boson Index = 0.99989

Photoelectric:

PE_{Bismutotantalite}=1,343.63 barns/electron
U=PE_{Bismutotantalite} x r_electron=9,864.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bismutotantalite is Not Radioactive

Bismutotantalite Classification

Dana Class:

8.1.6.3 (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.25-40 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 Bismutotantalite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bismutotantalite :
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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Bismutotantalite

Bi(Ta,Nb)O4
Dana No: 8.1.6.3 Strunz No: IV/D.25-40
Locality:

Notes: