Fergusonite-beta-(Ce) Mineral Data + Say FERGUSONITE-BETA-(CE)

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General Fergusonite-beta-(Ce) Information
Help on Chemical Formula: Chemical Formula: (Ce,La,Nd)NbO4
Help on Composition: Composition: Molecular Weight = 288.78 gm
   Lanthanum         9.62 %  La   11.28 % La2O3
   Cerium           19.41 %  Ce   22.73 % Ce2O3
   Praeseodymium     4.88 %  Pr    5.71 % Pr2O3
   La,Ce,Pr,Nd,Sm,   4.99 %  RE    5.82 % REE2O3
   Niobium          28.95 %  Nb   41.42 % Nb2O5
   Neodymium         9.99 %  Nd   11.65 % Nd2O3
   Oxygen           22.16 %  O
                   ______        ______ 
                   100.00 %       98.61 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: La0.2Ce0.4Pr0.1Nd0.2REE0.1Nb0.9O4
Help on Environment: Environment: In magnesian skarn around carbonatite-derived dolomitic marble.
Help on IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: Bayan Obo Fe-Nb-REE deposit, 130 km north of Baotaou, Inner Mongolia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the dimorphous relationship to fergusonite-(Ce).
 

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Fergusonite-beta-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4576:1:0.4832
Help on Cell Dimensions: Cell Dimensions: a = 5.19, b = 11.34, c = 5.48, Z = 4; beta = 95.57° V = 321.00 Den(Calc)= 5.98
Help on Crystal System: Crystal System: Monoclinic - SphenoidalH-M Symbol (2) Space Group: I2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.965(1), 3.058(1), 3.24(1),
Click Here for Large Fergusonite-beta-(Ce) Structure Window Crystal Structure:

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Santoro A , Marezio M , Roth R S , Minor D , Journal of Solid State Chemistry , 35 (1980) p.167-175, Neutron powder diffraction study of the, structures of CeTaO4, CeNbO4, and NdTaO4, Locality: synthetic

 

Physical Properties of Fergusonite-beta-(Ce)

Help on Color: Color: Red, Reddish brown.
Help on Density: Density: 5.34
Help on Diaphaniety: Diaphaniety: Subtranslucent to Opaque
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5.5-6.5 - Knife Blade-Pyrite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: pale rose
 

Optical Properties of Fergusonite-beta-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.126 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1931,KPDmeas= 0.2163,KC= 0.192
Help on Optical Data: Optical Data: Isotropic, n=2.155.
 

Calculated Properties of Fergusonite-beta-(Ce)

Help on Electron Density: Electron Density:

relectron=5.28 gm/cc
note: rFergusonite-beta-(Ce) =5.98 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.02992
Boson Index = 0.97008
Help on Photoelectric: Photoelectric:

PEFergusonite-beta-(Ce) = 313.39 barns/electron
U=PEFergusonite-beta-(Ce) x relectron=1,654.84 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 46,060.12 (Gamma Ray American Petroleum Institute Units)

Fergusonite-beta-(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) 660.37 ±165.09 grams of pure Fergusonite-beta-(Ce) .

Estimated Radioactivity from Fergusonite-beta-(Ce) - weak
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 / 6.84 cm 1,095,394 2.96E-05 46,060.12 15.14
100 gm / 3.17 cm 109,539 2.96E-06 4,606.01 1.51
10 gm / 1.47 cm 10,954 2.96E-07 460.60 0.15
1 gm / 6.84 mm 1,095 2.96E-08 46.06 0.02
0.1 gm / 3.17 mm 110 2.96E-09 4.61 0.00
0.01 gm / 1.47 mm 11 2.96E-10 0.46 0.00
0.001 gm / 0.68 mm 1 2.96E-11 0.05 0.00

Weight of pure Fergusonite-beta-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.98 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 ( 2.44 % Th) From Sum REE Elements (48.88 % REE)
 

Fergusonite-beta-(Ce) Classification
Help on Dana Class: Dana Class: 8.1.2.2 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.1)where A BO4
  (8.1.2)Dana Group
 
8.1.2.1 Fergusonite-beta-(Y) YNbO4 I2 2
 
8.1.2.2 Fergusonite-beta-(Ce) (Ce,La,Nd)NbO4 I2 2
 
8.1.2.3 Fergusonite-beta-(Nd) (Nd,Ce)NbO4 I2 2
Help on Strunz Class: Strunz Class: IV/D.24-20 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.24 - Fergusonite-(Y) - Formanite-(Y) series
 
IV/D.24-10 Fergusonite-beta-(Y) YNbO4 I2 2
 
IV/D.24-20 Fergusonite-beta-(Ce) (Ce,La,Nd)NbO4 I2 2
 
IV/D.24-30 Fergusonite-beta-(Nd) (Nd,Ce)NbO4 I2 2
 
IV/D.24-40 Fergusonite-(Y) YNbO4 I 41/a 4/m
 
IV/D.24-50 Fergusonite-(Ce)* (Ce,La,Y)NbO4 I 41/a 4/m
 
IV/D.24-60 Fergusonite-(Nd)* (Nd,Ce)(Nb,Ti)O4 I 41/a 4/m
 
IV/D.24-70 Formanite-(Y) YTaO4 I 41/a 4/m
 

Other Fergusonite-beta-(Ce) Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Fergusonite-beta-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Fergusonite-beta-(Ce)

(Ce,La,Nd)NbO4
Dana No: 8.1.2.2 Strunz No: IV/D.24-20
Locality:

 

Notes:

 
 
   
 
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