Plumbopyrochlore Mineral Data

Plumbopyrochlore Mineral Data +

[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.

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.

Synonym:

ICSD 45816

PDF 25-453

Plumbopyrochlore Image

Images:

Click Here for Larger Plumbopyrochlore Image

Plumbopyrochlore Ferrocolumbite

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

Images:

Plumbopyrochlore Plumbobetafite

Comments: Brown resinous plumbobetafite with yellowish plumbopyrochlore.
Location: Ploskaya Mountain, Keivy Region, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Plumbopyrochlore Crystallography

Cell Dimensions:

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

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): 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

Diaphaniety:

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

Optical Data:

Isotropic, n=2.08.

Calculated Properties of Plumbopyrochlore

Electron Density:

r_electron=4.80 gm/cc
note: r_{Plumbopyrochlore}=5.50 gm/cc.

Fermion Index

Fermion Index = 0.07719
Boson Index = 0.92281

Photoelectric:

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

Radioactivity:

GRapi = 366,187.63 (Gamma Ray American Petroleum Institute Units)

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	8,803,095	2.38E-04	366,187.63	120.39
100 gm / 3.26 cm	880,310	2.38E-05	36,618.76	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:

8.2.1.6 (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.17-80 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 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 -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 - Uranium Minerals 13 -École des Mines de Paris

Search for Plumbopyrochlore using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Plumbopyrochlore :
AA Mineral Specimens
B and L Minerals
Crystal Vaults
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Plumbopyrochlore Mineral Data :

Ask about Plumbopyrochlore here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Plumbopyrochlore Specimen Label here :

Plumbopyrochlore

(Pb,Y,U,Ca)2-xNb2O6(OH)
Dana No: 8.2.1.6 Strunz No: IV/C.17-80
Locality:

Notes: