Francoisite-(Nd) Mineral Data

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General Francoisite-(Nd) Information

Help on Chemical Formula: Chemical Formula: (Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)•6(H2O)

Help on Composition: Composition: Molecular Weight = 1,243.40 gm

Cerium 0.45 % Ce 0.53 % Ce₂O₃

Samarium 0.73 % Sm 0.84 % Sm₂O₃

Yttrium 0.72 % Y 0.91 % Y₂O₃

Uranium 61.26 % U 69.49 % UO₂

Phosphorus 4.73 % P 10.85 % P₂O₅

Hydrogen 1.10 % H 9.85 % H₂O

Neodymium 2.32 % Nd 2.71 % Nd₂O₃

Oxygen 28.69 % O

______ ______

100.00 % 95.17 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula: Nd_0.2Y_0.1Sm_0.06Ce_0.04(UO₂)_3.2O(PO₄)_1.9(OH)•6.3(H₂O)

Help on Environment: Environment: Alteration product of uraninite in a sedimentary Cu-Co deposit.

Help on IMA Status: IMA Status: Approved IMA 1988

Help on Locality: Locality: Kamoto-East Cu-Co mine, 6 km east of Kolwezi, Katanga Province, Zaire. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin: Named for Armand Francois (1922-), former Director of Geology for Gecamine and the dominant neodymium content.

Help on Name Pronunciation: Name Pronunciation: Francoisite-(Nd) + Pronunciation Say FRANCOISITE-(ND)

Help on Synonym: Synonym: ICSD 202796

PDF 42-1314

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Francoisite-(Nd) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0..&checktime(5958,1,0,':').8758

Help on Cell Dimensions: Cell Dimensions: a = 9.298, b = 15.605, c = 13.668, Z = 4; beta = 112.77° V = 1,828.61 Den(Calc)= 4.52

Help on Crystal System: 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): 7.79(1), 3.88(0.5), 5.76(0.5),

Click Here for Large Francoisite-(Nd) Structure Window 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

Physical Properties of Francoisite-(Nd)

Help on Cleavage: Cleavage: {010} Good

Help on Color: Color: Yellow.

Help on Density: Density: 4.06

Help on Diaphaneity: Diaphaneity: Translucent

Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.

Help on Habit: Habit: Platy - Sheet forms (e.g. micas).

Help on Hardness: Hardness: 3 - Calcite

Help on Luminescence: Luminescence: Radioactive.

Help on Luster: Luster: Vitreous (Glassy)

Help on Streak: Streak: yellow white

Optical Properties of Francoisite-(Nd)

Help on Gladstone-Dale: 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
Ncalc = 1.53 - 1.59

Help on Optical Data: Optical Data: Biaxial (-), a=1.65, b=1.74, g=1.75, bire=0.1000, 2V(Calc)=34, 2V(Meas)=35.

Calculated Properties of Francoisite-(Nd)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.90 gm/cc
note: Specific Gravity of Francoisite-(Nd) =4.52 gm/cc.

Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric: PE_{Francoisite-(Nd)}=1,632.17 barns/electron
U=PE_{Francoisite-(Nd)} x r_electron=6,370.39 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 4,512,101.50 (Gamma Ray American Petroleum Institute Units)
Concentration of Francoisite-(Nd) per GRapi unit = 221.63 (PPB)

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
Becquerels
(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 109,732,395 2.97E-03 4,512,101.50 1,483.43

100 gm / 3.48 cm 10,973,240 2.97E-04 451,210.15 148.34

10 gm / 1.62 cm 1,097,324 2.97E-05 45,121.02 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) **
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)

Francoisite-(Nd) Classification

Help on Dana Class: Dana Class: 42.04.14.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.04)where (AB)5 (XO4)2 Zq ƒL 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-(Nd) Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.75,p241,1990) OPTIC PROP.(Am.Min.,Vol.75,p241,1990)

Help on See Also: See Also: Links to other databases for Francoisite-(Nd) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Francoisite-(Nd)

(Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)•6(H2O)
Dana No: 42.04.14.01 Strunz No: 08.EC.05
Locality:

Notes: