Mineralogy Database

Bismutotantalite Mineral Data

Search Webmineral :

General Bismutotantalite Information

Help on Chemical  Formula: Chemical Formula: Bi(Ta,Nb)O4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: BiTa0.8Nb0.2O4
Help on Environment: Environment: In a pegmatite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1929
Help on Locality: Locality: Gamba Hill, Busiro Co., Uganda. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition (Bi, Ta).
Help on Name Pronunciation: Name Pronunciation: Bismutotantalite + Pronunciation Say BISMUTOTANTALITE

Bismutotantalite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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

Help on Axial Ratios: Axial Ratios: a:b:c =0.4788:1:0.4214
Help on Cell Dimensions: Cell Dimensions: a = 5.633, b = 11.763, c = 4.957, Z = 4; V = 328.46 Den(Calc)= 8.82
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.148(1), 2.945(0.6), 3.555(0.3),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 3 0) ( 0 1 0) ( 1 1 1) ( 1 0 1) ( 1 1 0)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Bismutotantalite

Help on Cleavage: Cleavage: {010} Perfect, {101} Distinct
Help on Color: Color: Light brown, Black.
Help on Density: Density: 8.51 - 8.84, Average = 8.67
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Adamantine - Metallic
Help on Streak: Streak: yellowish brown

Optical Properties of Bismutotantalite

Help on Gladstone-Dale: 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
Ncalc = 2.35 - 2.41
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.34 gm/cc
note: Specific Gravity of Bismutotantalite =8.82 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001106965
Boson Index = 0.9998893035
Help on Photoelectric: Photoelectric: PEBismutotantalite =1,343.63 barns/electron
U=PEBismutotantalite x rElectron Density=9,864.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bismutotantalite is Not Radioactive

Bismutotantalite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.06)Stibiocolumbite Group Stibiocolumbite SbNbO4 Pc21n mm2 Stibiotantalite SbTaO4 Pc21n mm2 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m
Help on  Strunz Class: 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 Bismutotantalite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bismutotantalite :
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

Search for Bismutotantalite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Bismutotantalite :

Ask about Bismutotantalite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa´┐Żol

Print or Cut-and-Paste your Bismutotantalite Specimen Label here :


Dana No: Strunz No: 04.DE.30





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.