General Francoisite-(Nd) Information
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Chemical Formula: |
(Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)·6(H2O) |
Composition: |
Molecular Weight = 1,243.40 gm |
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Cerium 0.45 % Ce 0.53 % Ce2O3 |
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Samarium 0.73 % Sm 0.84 % Sm2O3 |
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Yttrium 0.72 % Y 0.91 % Y2O3 |
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Uranium 61.26 % U 69.49 % UO2 |
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Phosphorus 4.73 % P 10.85 % P2O5 |
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Hydrogen 1.10 % H 9.85 % H2O |
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Neodymium 2.32 % Nd 2.71 % Nd2O3 |
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Oxygen 28.69 % O |
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______ ______ |
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100.00 % 95.17 % = TOTAL OXIDE |
Empirical Formula: |
Nd0.2Y0.1Sm0.06Ce0.04(UO2)3.2O(PO4)1.9(OH)·6.3(H2O) |
Environment: |
Alteration product of uraninite in a sedimentary Cu-Co deposit. |
IMA Status: |
Approved IMA 1988 |
Locality: |
Kamoto-East Cu-Co mine, 6 km east of Kolwezi, Katanga Province, Zaire. Link to MinDat.org Location Data. |
Name Origin: |
Named for Armand Francois (1922-), former Director of Geology for Gecamine and the dominant neodymium content. |
Synonym: |
ICSD 202796 |
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PDF 42-1314 |
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Francoisite-(Nd) Crystallography
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Axial Ratios: |
a:b:c =0.5958:1:0.8758 |
Cell Dimensions: |
a = 9.298, b = 15.605, c = 13.668, Z = 4; beta = 112.77° V = 1,828.61 Den(Calc)= 4.52 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c |
X Ray Diffraction: |
By Intensity(I/Io): 7.79(1), 3.88(0.5), 5.76(0.5), |
Crystal Structure:
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Piret P , Deliens M , Piret-Meunier J , Bulletin de Mineralogie , 111 (1988) p.443-449, La francoisite-(Nd), nouveau phosphate d uranyle et
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Physical Properties of Francoisite-(Nd)
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Cleavage: |
[010] Good |
Color: |
Yellow. |
Density: |
4.06 |
Diaphaniety: |
Translucent |
Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
Habit: |
Platy - Sheet forms (e.g. micas). |
Hardness: |
3 - Calcite |
Luminescence: |
Radioactive. |
Luster: |
Vitreous (Glassy) |
Streak: |
yellow white |
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Optical Properties of Francoisite-(Nd)
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Gladstone-Dale: |
CI meas= -0.352 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.215 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1578,KPDmeas= 0.1757,KC= 0.1299 |
Optical Data: |
Biaxial (-), a=1.65, b=1.74, g=1.75, bire=0.1000, 2V(Calc)=34, 2V(Meas)=35. |
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Calculated Properties of Francoisite-(Nd)
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Electron Density: |
relectron=3.90 gm/cc note: rFrancoisite-(Nd) =4.52 gm/cc. |
Fermion Index |
Fermion Index = 0.01139 Boson Index = 0.98861 |
Photoelectric: |
PEFrancoisite-(Nd) =1,632.17 barns/electron U=PEFrancoisite-(Nd) x relectron=6,370.39 barns/cc. |
Radioactivity: |
GRapi = 4,512,098.34 (Gamma Ray American Petroleum Institute Units)
Francoisite-(Nd) 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)
6.74 ± 1.69 grams of pure Francoisite-(Nd) .
Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 100 cm box)
674.11 ±168.53 grams of pure Francoisite-(Nd) .
Estimated Radioactivity from Francoisite-(Nd) - 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 / 7.50 cm |
109,732,385 |
2.97E-03 |
4,512,098.34 |
1,483.43 |
| 100 gm / 3.48 cm |
10,973,239 |
2.97E-04 |
451,209.83 |
148.34 |
| 10 gm / 1.62 cm |
1,097,324 |
2.97E-05 |
45,120.98 |
14.83 |
| 1 gm / 7.50 mm |
109,732 |
2.97E-06 |
4,512.10 |
1.48 |
| 0.1 gm / 3.48 mm |
10,973 |
2.97E-07 |
451.21 |
0.15 |
| 0.01 gm / 1.62 mm |
1,097 |
2.97E-08 |
45.12 |
0.01 |
| 0.001 gm / 0.75 mm |
110 |
2.97E-09 |
4.51 |
0.00 |
Weight of pure Francoisite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.52 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
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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 ( 0.17 % Th) From Sum REE Elements ( 3.50 % REE)
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Francoisite-(Nd) Classification
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Dana Class: |
42.4.14.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.4)where (AB)5 (XO4)2 Zq · x(H2O) |
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(42.4.14)Dana Group |
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42.4.14.1 Francoisite-(Nd) (Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)·6(H2O) P 21/c 2/m |
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42.4.14.2 IMA2004-029! (Ce,Nd,Ca)[(UO2)3O(OH)(PO4)2]·6(H2O) P 21/c 2/m |
Strunz Class: |
VII/E.07-70 VII - Phosphates, Arsenates and Vanadates |
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VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6- |
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VII/E.07 - Phosphuranylite series |
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VII/E.07-10 Phuralumite Al2(UO2)3(PO4)2(OH)6·10(H2O) P 21/a 2/m |
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VII/E.07-20 Mundite Al(UO2)3(PO4)2(OH)3·5(H2O) P 21cn,Pmcn Ortho |
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VII/E.07-25 Yingjiangite (K2,Ca)(UO2)7(PO4)4(OH)6·6(H2O) Bmmb 2/m 2/m 2/m |
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VII/E.07-30 Phosphuranylite KCa(H3O)3(UO2)7(PO4)4O4·8(H2O) C mcm 2/m 2/m 2/m |
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VII/E.07-40 Phurcalite Ca2(UO2)3O2(PO4)2·7(H2O) P bca 2/m 2/m 2/m |
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VII/E.07-50 Arsenuranylite Ca(UO2)4(AsO4)2(OH)4·6(H2O) Bmmb 2/m 2/m 2/m |
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VII/E.07-60 Bergenite Ca2Ba4[(UO3)2O2(PO4)2]3(H2O)16 P 21/c 2/m |
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VII/E.07-70 Francoisite-(Nd) (Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)·6(H2O) P 21/c 2/m |
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VII/E.07-80 Dewindtite Pb3[H(UO2)3O2(PO4)2]2·12(H2O) Bmmb 2/m 2/m 2/m |
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VII/E.07-90 Dumontite Pb2(UO2)3O2(PO4)2·5(H2O) P 21/m 2/m |
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VII/E.07-100 Hugelite Pb2(UO2)3(AsO4)2(OH)4·3(H2O) P 21/m 2/m |
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VII/E.07-110 Kamitugaite PbAl(UO2)5(PO4)2(OH)9·9.5(H2O) P1,P 1 Tri |
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VII/E.07-120 Kivuite? (Th,Ca,Pb)H2(UO2)4(PO4)2(OH)8·7(H2O) Unk Ortho |
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VII/E.07-130 Althupite ThAl(UO2)7(PO4)4(OH)5·15(H2O) P1 1 |
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VII/E.07-140 Vanmeersscheite U(UO2)3(PO4)2(OH)6·4(H2O) P mn21 mm2 |
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VII/E.07-150 Metavanmeersscheite U(UO2)3(PO4)2(OH)6·2(H2O) F dd2 mm2 |
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Other Francoisite-(Nd) Information
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References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.75,p241,1990) OPTIC PROP.(Am.Min.,Vol.75,p241,1990) |
See Also: |
Links to other databases for Francoisite-(Nd) :
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 - WWW-MINCRYST
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Print or Cut-and-Paste your Francoisite-(Nd) Specimen Label here :
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Francoisite-(Nd)
(Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)·6(H2O)
Dana No: 42.4.14.1 Strunz No: VII/E.07-70
Locality:
Notes:
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