Plumbopyrochlore Mineral Data

General Plumbopyrochlore Information

Chemical Formula:

(Pb,Y,U,Ca)2-xNb2O6(OH)

Composition:

Molecular Weight = 484.00 gm

Calcium 0.83 % Ca 1.16 % CaO

Yttrium 3.67 % Y 4.67 % Y₂O₃

Uranium 4.92 % U 5.91 % UO₃

Tantalum 3.74 % Ta 4.56 % Ta₂O₅

Niobium 26.87 % Nb 38.44 % Nb₂O₅

Iron 2.31 % Fe 2.97 % FeO

Silicon 1.16 % Si 2.48 % SiO₂

Hydrogen 0.10 % H 0.93 % H₂O

Lead 34.25 % Pb 36.89 % PbO

Oxygen 22.15 % O

______ ______

100.00 % 98.02 % = TOTAL OXIDE

Empirical Formula:

Pb_0.8Y_0.2U_0.1Ca_0.1Nb_1.4Si_0.2Fe²⁺_0.2Ta_0.1O_6.2(OH)_0.5

Environment:

Metasomatically altered granitic rocks.

IMA Status:

Approved IMA 1966

Locality:

Undisclosed locality in the Northern Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

For lead, PLUMBum, in its composition and its relationship to pyrochlore.

Name Pronunciation:

Plumbopyrochlore + Pronunciation

Synonym:

ICSD 45816

PDF 25-453

Plumbopyrochlore Image

Images:

Plumbopyrochlore Columbite-(Fe)

Comments: Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)).
Location: Holdazan, Buregteg, Mongolia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Fergusonite-(Y) Plumbopyrochlore

Comments: Brown resinous fergusonite-(Y) (as per communication with Pavel M. Kartashov) with yellowish plumbopyrochlore.
Location: Ploskaya Mountain, Keivy Region, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Plumbopyrochlore Columbite-(Mn)

Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain. Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality.
Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm.
© Pavel M. Kartashov

Plumbopyrochlore Crystallography

Cell Dimensions:

a = 10.534, Z = 8; V = 1,168.91 Den(Calc)= 5.50

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/I_o): 3.02(1), 1.581(0.9), 1.861(0.9),

Physical Properties of Plumbopyrochlore

Cleavage:

None

Color:

Brown, Greenish yellow, Dark brown, Red.

Density:

5.04

Diaphaneity:

Translucent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Hardness:

4.5-5.5 - Near Apatite

Luster:

Vitreous - Resinous

Optical Properties of Plumbopyrochlore

Gladstone-Dale:

CI meas= -0.126 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1964,KPDmeas= 0.2143,KC= 0.1902
Ncalc = 1.96 - 2.05

Optical Data:

Isotropic, n=2.08.

Calculated Properties of Plumbopyrochlore

Electron Density:

Bulk Density (Electron Density)=4.80 gm/cc
note: Specific Gravity of Plumbopyrochlore =5.50 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_{Plumbopyrochlore}= 823.00 barns/electron
U=PE_{Plumbopyrochlore} x r_electron=3,954.14 barns/cc.

Radioactivity:

GRapi = 366,187.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Plumbopyrochlore per GRapi unit = 2.73 (PPM)

Plumbopyrochlore 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) 83.06 ± 20.77 grams of pure Plumbopyrochlore .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 8306.3 ±2076.6 grams of pure Plumbopyrochlore .

**Estimated Radioactivity from Plumbopyrochlore** - 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 / 7.03 cm	8,803,098	2.38E-04	366,187.94	120.39
100 gm / 3.26 cm	880,310	2.38E-05	36,618.79	12.04
10 gm / 1.51 cm	88,031	2.38E-06	3,661.88	1.20
1 gm / 7.03 mm	8,803	2.38E-07	366.19	0.12
0.1 gm / 3.26 mm	880	2.38E-08	36.62	0.01
0.01 gm / 1.51 mm	88	2.38E-09	3.66	0.00
0.001 gm / 0.70 mm	9	2.38E-10	0.37	0.00

Weight of pure Plumbopyrochlore in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.50 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

Plumbopyrochlore Classification

Dana Class:

08.02.01.06 (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 Plumbopyrochlore Information

References:

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

See Also:

Links to other databases for Plumbopyrochlore :
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 - Uranium Minerals

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Plumbopyrochlore

(Pb,Y,U,Ca)2-xNb2O6(OH)
Dana No: 08.02.01.06 Strunz No: 04.DH.15
Locality:

Notes:

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