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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Forms: ( 1 1 1) ( 2 1 1) ( 1 1 0)

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Physical Properties of Bismutopyrochlore

Cleavage:

None

Color:

Black, Dark greenish brown.

Density:

4.97

Diaphaneity:

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
Ncalc = 2.08

Optical Data:

Isotropic, n=2.1.

Calculated Properties of Bismutopyrochlore

Electron Density:

Bulk Density (Electron Density)=4.50 gm/cc
note: Specific Gravity of Bismutopyrochlore =4.97 gm/cc.

Fermion Index:

Fermion Index = 0.0092451026
Boson Index = 0.9907548974

Photoelectric:

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

Radioactivity:

GRapi = 979,050.09 (Gamma Ray American Petroleum Institute Units)
Concentration of Bismutopyrochlore per GRapi unit =1,021.40 (PPB)

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	22,711,300	6.14E-04	979,050.09	321.88
100 gm / 3.37 cm	2,271,130	6.14E-05	97,905.01	32.19
10 gm / 1.57 cm	227,113	6.14E-06	9,790.50	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	97.91	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:

08.02.01.09 (08)Multiple Oxides with Nb, Ta, and Ti

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

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

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

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

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

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

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

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

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

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

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

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 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 - Handbook of Mineralogy (MinSocAm)
6 - MinDAT
7 - MinMax(Deutsch)
8 - MinMax(English)
9 - Mineralienatlas (Deutsch)
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - Uranium Minerals

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Bismutopyrochlore

(Bi,U,Ca,Pb)1+x(Nb,Ta)2O6(OH)•n(H2O)
Dana No: 08.02.01.09 Strunz No: 04.DH.15
Locality:

Notes: