Richetite Mineral Data + Say RICHETITE


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General Richetite Information

Help on Chemical  Formula: Chemical Formula: PbU++++++4O13·4(H2O)
Help on Composition: Composition: Molecular Weight = 1,439.37 gm
   Uranium   66.15 %  U    79.49 % UO3
   Hydrogen   0.56 %  H     5.01 % H2O
   Lead      14.40 %  Pb   15.51 % PbO
   Oxygen    18.90 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbU4O13·4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1947
Help on Locality: Locality: Shinkolobwe mine, Shaba, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Emile Richet (1884-1938), chief geologist, Union Miniere du Haut Katanga.
Help on Synonym: Synonym: ICSD 85570
  PDF 30-370
 

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Richetite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6666:1:1.3515
Help on Cell Dimensions: Cell Dimensions: a = 20.1, b = 12.06, c = 16.3, Z = 4; alpha = 1103.8°, beta = 115.1°, gamma = 90.4° V = 1,443.89 Den(Calc)= 6.62
Help on Crystal System: Crystal System: TriclinicSpace Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.122(1), 7.12(0.8), 3.55(0.6),
Click Here for Large Richetite Structure Window Crystal Structure:

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Help on Above


Burns P C , The Canadian Mineralogist , 36 (1998) p.187-199, The structure of richetite, a rare lead uranyl oxide hydrate

 

Physical Properties of Richetite

Help on Cleavage: Cleavage: [001] Perfect, [010] Fair
Help on Color: Color: Black.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Adamantine
 

Optical Properties of Richetite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.111 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.146,KC= 0.1314
Help on Optical Data: Optical Data: Biaxial (-), a=1.9, b=2, g=2, bire=0.1000, 2V(Calc)=0, 2V(Meas)=large.
Help on Pleochroism (x): Pleochroism (x): pale brown.
Help on Pleochroism (y): Pleochroism (y): dull brown.
Help on Pleochroism (z): Pleochroism (z): dull brown.
 

Calculated Properties of Richetite

Help on Electron Density: Electron Density:

relectron=5.46 gm/cc
note: rRichetite =6.62 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03666
Boson Index = 0.96334
Help on Photoelectric: Photoelectric:

PERichetite =2,086.02 barns/electron
U=PERichetite x relectron=11397.76 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 4,653,668.72 (Gamma Ray American Petroleum Institute Units)

Richetite 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) 6.54 ± 1.63 grams of pure Richetite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 653.61 ±163.40 grams of pure Richetite .

Estimated Radioactivity from Richetite - very 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 118,405,135 3.20E-03 4,653,668.72 1,529.97
100 gm / 3.07 cm 11,840,514 3.20E-04 465,366.87 153.00
10 gm / 1.42 cm 1,184,051 3.20E-05 46,536.69 15.30
1 gm / 6.61 mm 118,405 3.20E-06 4,653.67 1.53
0.1 gm / 3.07 mm 11,841 3.20E-07 465.37 0.15
0.01 gm / 1.42 mm 1,184 3.20E-08 46.54 0.02
0.001 gm / 0.66 mm 118 3.20E-09 4.65 0.00

Weight of pure Richetite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.62 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
 

Richetite Classification

Help on  Dana Class: Dana Class: 5.9.5.1 (5)Oxides Containing Uranium and Thorium
  (5.9)with a cation charge of 6+ containing Pb or Bi and some water of hydration or hydroxyl
  (5.9.5)Dana Group
 
5.9.5.1 Richetite PbU4O13·4(H2O) P1 or P1 Tri
Help on  Strunz Class: Strunz Class: IV/H.07-60 IV - Oxides
  IV/H - Uranyl ([UO2]2+) hydroxides and hydrates
  IV/H.07 - Fourmarierite - Masuyite series
 
IV/H.07-10 Fourmarierite Pb(UO2)4O3(OH)4·4(H2O) Bb21m mm2
 
IV/H.07-20 Vandendriesscheite Pb(UO2)10O6(OH)11·11(H2O) P bca 2/m 2/m 2/m
 
IV/H.07-30 Metavandendriesscheite PbU7O22·n(H2O)(n<12) Pmma,Pm2a Ortho
 
IV/H.07-40 Sayrite Pb2(UO2)5O6(OH)2·4(H2O) P 21/c 2/m
 
IV/H.07-45 Spriggite! Pb3[(UO2)6O8(OH)2](H2O)x;x~3 C 2/c 2/m
 
IV/H.07-50 Curite Pb3x(H2O)2[(UO2)4x(OH)3-x]2,x~0.5 Pnam 2/m 2/m 2/m
 
IV/H.07-60 Richetite PbU4O13·4(H2O) P1 or P1 Tri
 
IV/H.07-70 Masuyite Pb[(UO2)3O3(OH)2]·3(H2O) Pn m
 

Other Richetite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Richetite :
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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Print or Cut-and-Paste your Richetite Specimen Label here :

Richetite

PbU++++++4O13·4(H2O)
Dana No: 5.9.5.1 Strunz No: IV/H.07-60
Locality:

 

Notes:

 

 
   
 
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