Bismutomicrolite Mineral Data

Bismutomicrolite Mineral Data +

General Bismutomicrolite Information

Chemical Formula:

(Bi,Ca)(Ta,Nb)2O6(OH)

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

Empirical Formula:

Bi_0.6Ca_0.4Ta_1.7Nb_0.3O₆(OH)

Environment:

A late hydrothermal replacement of bismutotantalite in a lithium-bearing pegmatite.

IMA Status:

Approved IMA 1977

Locality:

In the Wampewo pegmatite, Gamba Hill, near Kampala, Uganda. Link to MinDat.org Location Data.

Name Origin:

Assigned by the IMA pyrochlore nomenclature group for the predominant bismuth content and to microlite.

Synonym:

Westgrenite

Bismutomicrolite Image

Images:

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

Cell Dimensions:

a = 10.43, Z = 8; V = 1,134.63 Den(Calc)= 6.91

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 2.997(1), 1.568(0.9), 1.838(0.9),

Physical Properties of Bismutomicrolite

Cleavage:

None

Color:

Brown, Grayish black, Yellow, Dark gray, Pink.

Density:

6.83

Diaphaniety:

Translucent to Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Luster:

Resinous

Streak:

gray white

Optical Properties of Bismutomicrolite

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

Optical Data:

Isotropic, n=2.

Calculated Properties of Bismutomicrolite

Electron Density:

r_electron=5.82 gm/cc
note: r_{Bismutomicrolite}=6.83 gm/cc.

Fermion Index

Fermion Index = 0.00019
Boson Index = 0.99981

Photoelectric:

PE_{Bismutomicrolite}=1,040.41 barns/electron
U=PE_{Bismutomicrolite} x r_electron=6,051.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bismutomicrolite is Not Radioactive

Bismutomicrolite Classification

Dana Class:

8.2.2.5 (8)Multiple Oxides with Nb, Ta, and Ti

(8.2)where (A)2 (B2O6) (O,OH,F)

(8.2.2)Pyrochlore Group (Microlite Subgroup; Ta>Nb;(Ta+Nb)>2(Ti)

8.2.2.1 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

8.2.2.2 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

8.2.2.3 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

8.2.2.4 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

8.2.2.5 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

8.2.2.6 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

8.2.2.7 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

8.2.2.8 IMA1998-018! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m

Strunz Class:

IV/C.18-70 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.18 - Pyrochlore group, Microlite series with Ta > Nb

IV/C.18-10 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

IV/C.18-20 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-30 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-40 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-50 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

IV/C.18-60 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m

IV/C.18-70 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

IV/C.18-80 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

Other Bismutomicrolite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bismutomicrolite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Bismutomicrolite

(Bi,Ca)(Ta,Nb)2O6(OH)
Dana No: 8.2.2.5 Strunz No: IV/C.18-70
Locality:

Notes: