Bismutopyrochlore Mineral Data

Bismutopyrochlore Mineral Data

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General Bismutopyrochlore Information

Chemical Formula:

(Bi,U,Ca,Pb)1+x(Nb,Ta)2O6(OH)·n(H2O)

Composition:

Molecular Weight = 562.81 gm

Calcium 2.14 % Ca 2.99 % CaO

Uranium 12.69 % U 15.25 % UO₃

Tantalum 8.04 % Ta 9.81 % Ta₂O₅

Niobium 24.76 % Nb 35.42 % Nb₂O₅

Bismuth 14.85 % Bi 16.56 % Bi₂O₃

Hydrogen 1.72 % H 15.36 % H₂O

Lead 3.68 % Pb 3.97 % PbO

Oxygen 32.12 % O

______ ______

100.00 % 99.36 % = TOTAL OXIDE

Empirical Formula:

Bi_0.4U_0.3Ca_0.3Pb_0.1Nb_1.5Ta_0.25O₆(OH)·4.3(H₂O)

Environment:

Formed on lepidolite in miarolitic cavities in a pegmatite vein. A member of the pyrochlore group

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Mika pegmatite vein, central Rangkul' Highlands, Eastern Pamirs, Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for its composition and relationship to pyrochlore.

Synonym:

IMA1998-059

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Bismutopyrochlore Crystallography

Cell Dimensions:

a = 10.41, Z = 6; V = 1,128.11 Den(Calc)= 4.97

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): 2.967(1)(111), 1.569(0.9)(262), 1.848(0.9)(044),1.195(0.8)(662), 2.614(0.7)(224), 1.145(0.5)(735), 1.5(0.4)(444), 5.98(0.4)(111),

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Physical Properties of Bismutopyrochlore

Cleavage:

None

Color:

Black, Dark greenish brown.

Density:

4.97

Diaphaniety:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Amorphous - No crystalline form or imitative shape.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Hardness:

5 - Apatite

Luster:

Adamantine

Streak:

yellow

Optical Properties of Bismutopyrochlore

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2213,KPDmeas= 0.2213,KC= 0.2169

Optical Data:

Isotropic, n=2.1.

Calculated Properties of Bismutopyrochlore

Electron Density:

r_electron=4.50 gm/cc
note: r_{Bismutopyrochlore}=4.97 gm/cc.

Fermion Index

Fermion Index = 0.00924
Boson Index = 0.99076

Photoelectric:

PE_{Bismutopyrochlore}= 774.89 barns/electron
U=PE_{Bismutopyrochlore} x r_electron=3,486.40 barns/cc.

Radioactivity:

GRapi = 979,048.96 (Gamma Ray American Petroleum Institute Units)

Bismutopyrochlore is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 31.07 ± 7.77 grams of pure Bismutopyrochlore .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 3106.8 ±776.69 grams of pure Bismutopyrochlore .

**Estimated Radioactivity from Bismutopyrochlore** - strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.27 cm	22,711,287	6.14E-04	979,048.96	321.88
100 gm / 3.37 cm	2,271,129	6.14E-05	97,904.90	32.19
10 gm / 1.57 cm	227,113	6.14E-06	9,790.49	3.22
1 gm / 7.27 mm	22,711	6.14E-07	979.05	0.32
0.1 gm / 3.37 mm	2,271	6.14E-08	97.90	0.03
0.01 gm / 1.57 mm	227	6.14E-09	9.79	0.00
0.001 gm / 0.73 mm	23	6.14E-10	0.98	0.00

Weight of pure Bismutopyrochlore in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.97 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Bismutopyrochlore Classification

Dana Class:

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

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

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

8.2.1.1 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m

8.2.1.2 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6·(H2O,K) F d3m 4/m 3 2/m

8.2.1.3 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m

8.2.1.4 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3

8.2.1.5 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

8.2.1.6 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m

8.2.1.7 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

8.2.1.8 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m

8.2.1.9 Bismutopyrochlore ! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)·n(H2O) F d3m 4/m 3 2/m

Strunz Class:

IV/C.17-85 IV - Oxides

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

IV/C.17 - Pyrochlore group, Pyrochlore series with Nb > Ti

IV/C.17-10 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m

IV/C.17-20 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-30 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6·(H2O,K) F d3m 4/m 3 2/m

IV/C.17-40 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-50 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-60 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3

IV/C.17-70 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

IV/C.17-80 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m

IV/C.17-85 Bismutopyrochlore (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)·n(H2O) F d3m 4/m 3 2/m

IV/C.17-90 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

Other Bismutopyrochlore Information

References:

NAME( AmMin, vol 85, p 1561) PHYS. PROP.(AmMin, vol 85, p 1561) OPTIC PROP.(AmMin, vol 85, p 1561)

See Also:

Links to other databases for Bismutopyrochlore :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 - Uranium Minerals

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Bismutopyrochlore

(Bi,U,Ca,Pb)1+x(Nb,Ta)2O6(OH)·n(H2O)
Dana No: 8.2.1.9 Strunz No: IV/C.17-85
Locality:

Notes: