Plumbomicrolite Mineral Data + Say PLUMBOMICROLITE

General Plumbomicrolite Information
Help on Chemical Formula: Chemical Formula: (Pb,Ca,U)2Ta2O6(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb1.2Ca0.6U0.2Ta2O6(OH)
Help on Environment: Environment: In alluvium near lithium-rich pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Mumba district, Kobokobo, Kivu province, Congo (Zaire). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for lead, "PLUMBum" and its relationship to microlite.
Help on Synonym: Synonym: ICSD 45821
  PDF 44-670
 

Plumbomicrolite Image

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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
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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
Help on Cell Dimensions: Cell Dimensions: a = 10.56, Z = 6; V = 1,177.58 Den(Calc)= 6.73
Help on Crystal System: 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/Io): 1.867(1), 1.593(0.99), 2.642(0.65),
 

Physical Properties of Plumbomicrolite

Help on Color: Color: Greenish yellow, Yellow, Orange.
Help on Density: Density: 6.6
Help on Diaphaniety: Diaphaniety: Translucent
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: white
 

Optical Properties of Plumbomicrolite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.95-2.02.
 

Calculated Properties of Plumbomicrolite

Help on Electron Density: Electron Density:

relectron=5.51 gm/cc
note: rPlumbomicrolite =6.60 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.06969
Boson Index = 0.93031
Help on Photoelectric: Photoelectric:

PEPlumbomicrolite =1,299.96 barns/electron
U=PEPlumbomicrolite x relectron=7,159.91 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 425,848.75 (Gamma Ray American Petroleum Institute Units)

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 10,716,193 2.90E-04 425,848.75 140.01
100 gm / 3.07 cm 1,071,619 2.90E-05 42,584.88 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
Help on Dana Class: Dana Class: 8.2.2.3 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.2)where (A)2 (B2O6) (O,OH,F)
  (8.2.2)Pyrochlore Group (Microlite Subgroup; Ta>Nb;(Ta+Nb)>2(Ti)
 
8.2.2.1 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m
 
8.2.2.2 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
8.2.2.3 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m
 
8.2.2.4 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
8.2.2.5 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
8.2.2.6 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m
 
8.2.2.7 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
8.2.2.8 IMA1998-018! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m
Help on Strunz Class: Strunz Class: IV/C.18-50 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.18 - Pyrochlore group, Microlite series with Ta > Nb
 
IV/C.18-10 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m
 
IV/C.18-20 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m
 
IV/C.18-30 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
IV/C.18-40 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
IV/C.18-50 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m
 
IV/C.18-60 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m
 
IV/C.18-70 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
IV/C.18-80 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 

Other Plumbomicrolite Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Plumbomicrolite :
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

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Plumbomicrolite

(Pb,Ca,U)2Ta2O6(OH)
Dana No: 8.2.2.3 Strunz No: IV/C.18-50
Locality:

 

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