Plumbomicrolite Mineral Data

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General Plumbomicrolite Information

Chemical Formula:

(Pb,Ca,U)2Ta2O6(OH)

Composition:

Molecular Weight = 795.19 gm

Calcium 3.02 % Ca 4.23 % CaO

Uranium 5.99 % U 6.79 % UO₂

Tantalum 45.51 % Ta 55.57 % Ta₂O₅

Hydrogen 0.13 % H 1.13 % H₂O

Lead 31.27 % Pb 33.68 % PbO

Oxygen 14.08 % O

______ ______

100.00 % 101.41 % = TOTAL OXIDE

Empirical Formula:

Pb_1.2Ca_0.6U_0.2Ta₂O₆(OH)

Environment:

In alluvium near lithium-rich pegmatites.

IMA Status:

Approved IMA 1977

Locality:

Mumba district, Kobokobo, Kivu province, Congo (Zaire). Link to MinDat.org Location Data.

Name Origin:

Named for lead, "PLUMBum" and its relationship to microlite.

Name Pronunciation:

Plumbomicrolite + Pronunciation

Synonym:

ICSD 45821

PDF 44-670

Plumbomicrolite Image

Images:

Plumbomicrolite

Comments: Gray, octahedral crystal of plumbomicrolite.
Location: Ploskaya Mt, Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 20x17x13 mm.
© John Betts - Fine Minerals

Images:

Plumbomicrolite

Comments: Large octahedral crystal of brownish black plumbomicrolite on matrix.
Location: Berg Ploskaya, West Keivy Massif, Kola Peninsula, Russia. Scale: See Image.
© Paul M. Schumacher

Plumbomicrolite Crystallography

Cell Dimensions:

a = 10.56, Z = 6; V = 1,177.58 Den(Calc)= 6.73

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): 1.867(1), 1.593(0.99), 2.642(0.65),

Crystal Structure:

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Groult D , Michel C , Raveau B , Journal of Inorganic and Nuclear Chemistry , 37 (1975) p.2203-2205, Sur de nouveaux pyrochlores lacunaires d’ions bivalents synthetises par, echanges d’ions, Locality: synthetic

Physical Properties of Plumbomicrolite

Color:

Greenish yellow, Yellow, Orange.

Density:

6.6

Diaphaneity:

Translucent

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

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

Hardness:

5 - Apatite

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Plumbomicrolite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1464,KPDmeas= 0.1492,KC= 0.1482
Ncalc = 1.98 - 2

Optical Data:

Isotropic, n=1.95-2.02.

Calculated Properties of Plumbomicrolite

Electron Density:

Bulk Density (Electron Density)=5.51 gm/cc
note: Specific Gravity of Plumbomicrolite =6.60 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Plumbomicrolite}=1,299.96 barns/electron
U=PE_{Plumbomicrolite} x r_electron=7,159.91 barns/cc.

Radioactivity:

GRapi = 425,849.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Plumbomicrolite per GRapi unit = 2.35 (PPM)

Plumbomicrolite 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) 71.43 ± 17.86 grams of pure Plumbomicrolite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 7142.6 ±1785.6 grams of pure Plumbomicrolite .

**Estimated Radioactivity from Plumbomicrolite** - 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 / 6.61 cm	10,716,196	2.90E-04	425,849.03	140.01
100 gm / 3.07 cm	1,071,620	2.90E-05	42,584.90	14.00
10 gm / 1.43 cm	107,162	2.90E-06	4,258.49	1.40
1 gm / 6.61 mm	10,716	2.90E-07	425.85	0.14
0.1 gm / 3.07 mm	1,072	2.90E-08	42.58	0.01
0.01 gm / 1.43 mm	107	2.90E-09	4.26	0.00
0.001 gm / 0.66 mm	11	2.90E-10	0.43	0.00

Weight of pure Plumbomicrolite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.60 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

Plumbomicrolite Classification

Dana Class:

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

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

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

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

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

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

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

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

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

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

08.02.02.08 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F 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 Plumbomicrolite 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 Plumbomicrolite :
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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Plumbomicrolite

(Pb,Ca,U)2Ta2O6(OH)
Dana No: 08.02.02.03 Strunz No: 04.DH.15
Locality:

Notes: