Mineralogy Database

Bismutomicrolite Mineral Data

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General Bismutomicrolite Information

Help on Chemical  Formula: Chemical Formula: (Bi,Ca)(Ta,Nb)2O6(OH)
Help on Composition: Composition: Molecular Weight = 589.91 gm
   Calcium    2.72 %  Ca    3.80 % CaO
   Tantalum  52.15 %  Ta   63.67 % Ta2O5
   Niobium    4.72 %  Nb    6.76 % Nb2O5
   Bismuth   21.26 %  Bi   23.70 % Bi2O3
   Hydrogen   0.17 %  H     1.53 % H2O
   Oxygen    18.99 %  O
            ______        ______ 
            100.00 %       99.46 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Bi0.6Ca0.4Ta1.7Nb0.3O6(OH)
Help on Environment: Environment: A late hydrothermal replacement of bismutotantalite in a lithium-bearing pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: In the Wampewo pegmatite, Gamba Hill, near Kampala, Uganda. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Assigned by the IMA pyrochlore nomenclature group for the predominant bismuth content and to microlite.
Help on Name Pronunciation: Name Pronunciation: Bismutomicrolite + Pronunciation Say BISMUTOMICROLITE
Help on Synonym: Synonym: Westgrenite
 

Bismutomicrolite Image

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  Bismutomicrolite

Comments: A dark crystal of bismutomicrolite in pearly muscovite.
Location: Malkhan Range, Krasny Chikoy, Chitinskaya Oblast', Transbaikalia, Eastern-Siberian Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Bismutomicrolite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.43, Z = 8; V = 1,134.63 Den(Calc)= 6.91
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.997(1), 1.568(0.9), 1.838(0.9),
 

Physical Properties of Bismutomicrolite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Grayish black, Yellow, Dark gray, Pink.
Help on Density: Density: 6.83
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Resinous
Help on Streak: Streak: gray white
 

Optical Properties of Bismutomicrolite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.106 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.116 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1447,KPDmeas= 0.1464,KC= 0.1637
Ncalc = 2.12 - 2.13
Help on Optical Data: Optical Data: Isotropic, n=2.
 

Calculated Properties of Bismutomicrolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.82 gm/cc
note: Specific Gravity of Bismutomicrolite =6.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001908608
Boson Index = 0.9998091392
Help on Photoelectric: Photoelectric: PEBismutomicrolite =1,040.41 barns/electron
U=PEBismutomicrolite x rElectron Density=6,051.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bismutomicrolite is Not Radioactive
 

Bismutomicrolite Classification

Help on  Dana Class: Dana Class: 08.02.02.05 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.02)where (A)2 (B2O6) (O,OH,F)
  (08.02.02)Pyrochlore Group (Microlite Subgroup; Ta>Nb;(Ta+Nb)>2(Ti)
 
08.02.02.01 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m
 
08.02.02.02 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.02.03 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m
 
08.02.02.04 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
08.02.02.05 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
08.02.02.06 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.02.07 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.02.08 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 04.DH.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DH -With large (� medium-sized) cations; sheets of edge-sharing octahedra
 
04.DH.15 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic
 
04.DH.15 Betafite (Ca,U)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Ferritungstite (K,Ca,Na)(W,Fe)2(O,OH)6•(H2O) F d3m 4/m 3 2/m
 
04.DH.15 Cesstibtantite (Cs,Na)SbTa4O12 F d3m 4/m 3 2/m
 
04.DH.15 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Jixianite Pb(W,Fe)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6•(H2O,K) F d3m 4/m 3 2/m
 
04.DH.15 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m
 
04.DH.15 Plumbobetafite (Pb,U,Ca)(Ti,Nb)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Stibiobetafite (Sb,Ca)2(Ti,Nb,Ta)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)•n(H2O) F d3m 4/m 3 2/m
 
04.DH.15 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m
 
04.DH.15 Yttrobetafite-(Y) (Y,U,Ce)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3
 
04.DH.15 Elsmoreite! WO3•0.5(H2O) F d3m 4/m 3 2/m
 

Other Bismutomicrolite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bismutomicrolite :
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
15 - WWW-MINCRYST

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Bismutomicrolite

(Bi,Ca)(Ta,Nb)2O6(OH)
Dana No: 08.02.02.05 Strunz No: 04.DH.15
Locality:

 

Notes:

 

 
   
 


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