Francoisite-(Ce) Mineral Data

General Francoisite-(Ce) Information

Chemical Formula:

(Ce,Nd,Ca)[(UO2)3O(OH)(PO4)2]•6(H2O)

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

Empirical Formula:

Ce_0.6Nd_0.3Ca_0.1(UO₂)₃OOH(PO₄)₂•6(H₂O)

Environment:

Related to phosphuranyllite group

IMA Status:

Proposed IMA 2004 (Dana # Added)

Locality:

La Creusaz, Valais, Switzerland, and Radium Ridge, South Australia Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

Name Pronunciation:

Francoisite-(Ce) + Pronunciation

Synonym:

IMA2004-029

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Francoisite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.5985:1:0.8833

Cell Dimensions:

a = 9.295, b = 15.53, c = 13.718, Z = 4; beta = 112.39° V = 1,830.93 Den(Calc)= 4.62

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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)

Optical Data:

NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.1329) where Ncalc=Dcalc*KC+1

Calculated Properties of Francoisite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Francoisite-(Ce) =4.62 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Francoisite-(Ce)}=1,529.60 barns/electron
U=PE_{Francoisite-(Ce)} x r_electron=6,106.68 barns/cc.

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 Becquerels (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

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

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

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: