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Francoisite-(Ce) Mineral Data

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General Francoisite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,Nd,Ca)[(UO2)3O(OH)(PO4)2]•6(H2O)
Help on Composition: Composition: Molecular Weight = 1,272.47 gm
   Calcium      0.31 %  Ca    0.44 % CaO
   Cerium       6.61 %  Ce    7.74 % Ce2O3
   Uranium     56.12 %  U    63.66 % UO2
   Phosphorus   4.87 %  P    11.16 % P2O5
   Hydrogen     1.03 %  H     9.20 % H2O
   Neodymium    3.40 %  Nd    3.97 % Nd2O3
   Oxygen      27.66 %  O
              ______        ______ 
              100.00 %       96.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce0.6Nd0.3Ca0.1(UO2)3OOH(PO4)2•6(H2O)
Help on Environment: Environment: Related to phosphuranyllite group
Help on IMA Status: IMA Status: Proposed IMA 2004 (Dana # Added)
Help on Locality: Locality: La Creusaz, Valais, Switzerland, and Radium Ridge, South Australia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Commission on New Minerals, Nomenclature and Classification (CNMNC)
Help on Name Pronunciation: Name Pronunciation: Francoisite-(Ce) + Pronunciation Say FRANCOISITE-(CE)
Help on Synonym: Synonym: IMA2004-029
 

Francoisite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5985:1:0.8833
Help on Cell Dimensions: Cell Dimensions: a = 9.295, b = 15.53, c = 13.718, Z = 4; beta = 112.39° V = 1,830.93 Den(Calc)= 4.62
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.76(1), 3.14(0.8), 3.43(0.7),3.87(0.6), 5.77(0.6), 2.038(0.4), 4.37(0.3), 4.42(0.3),
 

Optical Properties of Francoisite-(Ce)

Help on Optical Data: Optical Data: NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.1329) where Ncalc=Dcalc*KC+1
 

Calculated Properties of Francoisite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Francoisite-(Ce) =4.62 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFrancoisite-(Ce) =1,529.60 barns/electron
U=PEFrancoisite-(Ce) x relectron=6,106.68 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,142,765.15 (Gamma Ray American Petroleum Institute Units)
Concentration of Francoisite-(Ce) per GRapi unit = 241.38 (PPB)

Francoisite-(Ce) 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) 7.34 ± 1.84 grams of pure Francoisite-(Ce) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 734.21 ±183.55 grams of pure Francoisite-(Ce) .

Estimated Radioactivity from Francoisite-(Ce) - 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 / 7.45 cm 100,675,424 2.72E-03 4,142,765.15 1,362.00
100 gm / 3.46 cm 10,067,542 2.72E-04 414,276.52 136.20
10 gm / 1.60 cm 1,006,754 2.72E-05 41,427.65 13.62
1 gm / 7.45 mm 100,675 2.72E-06 4,142.77 1.36
0.1 gm / 3.46 mm 10,068 2.72E-07 414.28 0.14
0.01 gm / 1.60 mm 1,007 2.72E-08 41.43 0.01
0.001 gm / 0.74 mm 101 2.72E-09 4.14 0.00

Weight of pure Francoisite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.62 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
Estimated Thorium Activity ( 0.50 % Th) From Sum REE Elements (10.01 % REE)
 

Francoisite-(Ce) Classification

Help on  Dana Class: Dana Class: 42.04.14.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.04)where (AB)5 (XO4)2 Zq � x(H2O)
  (42.04.14)Francoisite Group
 
42.04.14.01 Francoisite-(Nd) (Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)•6(H2O) P 21/c 2/m
 
42.04.14.02 Francoisite-(Ce)! (Ce,Nd,Ca)[(UO2)3O(OH)(PO4)2]•6(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.EC.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.E - Uranyl Phosphates and Arsenates
  08.EC -UO2:RO4 = 3:2
 
08.EC.05 Francoisite-(Nd) (Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)•6(H2O) P 21/c 2/m
 
08.EC.05 Phuralumite Al2(UO2)3(PO4)2(OH)6•10(H2O) P 21/a 2/m
 
08.EC.05 Upalite Al(UO2)3(PO4)2O(OH)•7(H2O) P 21/a 2/m
 
08.EC.05 Francoisite-(Ce)! (Ce,Nd,Ca)[(UO2)3O(OH)(PO4)2]•6(H2O) P 21/c 2/m
 

Other Francoisite-(Ce) Information

Help on See Also: See Also: Links to other databases for Francoisite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Francoisite-(Ce) Specimen Label here :

Francoisite-(Ce)

(Ce,Nd,Ca)[(UO2)3O(OH)(PO4)2]•6(H2O)
Dana No: 42.04.14.02 Strunz No: 08.EC.05
Locality:

 

Notes: