Mineralogy Database

Fergusonite-(Nd) Mineral Data

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General Fergusonite-(Nd) Information

Help on Chemical  Formula: Chemical Formula: (Nd,Ce)(Nb,Ti)O4
Help on Composition: Composition: Molecular Weight = 267.16 gm
   Cerium           10.49 %  Ce   12.29 % Ce2O3
   La,Ce,Pr,Nd,Sm,  16.17 %  RE   18.86 % REE2O3
   Titanium          3.58 %  Ti    5.98 % TiO2
   Niobium          27.82 %  Nb   39.80 % Nb2O5
   Iron              4.18 %  Fe    5.38 % FeO
   Neodymium        16.20 %  Nd   18.89 % Nd2O3
   Oxygen           21.56 %  O
                   ______        ______ 
                   100.00 %      101.20 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Nd0.3Ce0.2Fe2+0.2REE0.3Nb0.8Ti0.2O3.6
Help on Environment: Environment: Rare-earth deposit.
Help on IMA Status: IMA Status: Not Approved IMA 1987
Help on Locality: Locality: Bayan Obo, Inner Mongolia, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition and a member of the fergusonite group.
Help on Name Pronunciation: Name Pronunciation: Fergusonite-(Nd) + Pronunciation Say FERGUSONITE-(ND)

Fergusonite-(Nd) Image

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  Fergusonite-(Nd)   Ferriallanite-(Ce)

Comments: Orange-brown ferusonite-(Nd) grains in ferriallanite-(Ce) zone of the vein. Main black inclusions are ferriallanite-(Ce) crystals. White matrix is mixture of calcian strontianite and strontian calcite.
Location: Tornebohmite vein, Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: FOV 1 cm.
© Pavel M. Kartashov

Fergusonite-(Nd) Crystallography

Help on Crystal System: Crystal System: Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 41/a

Physical Properties of Fergusonite-(Nd)

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Dark brown.
Help on Density: Density: 4.5 - 5.7, Average = 5.09
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 5.5-6.5 - Knife Blade-Pyrite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brown

Optical Properties of Fergusonite-(Nd)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.176 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2451,KC= 0.2084
Ncalc = 1.94 - 2.19
Help on Optical Data: Optical Data: Uniaxial (-), e=2.2, w=2.3, bire=0.1000.

Calculated Properties of Fergusonite-(Nd)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.55 gm/cc
note: Specific Gravity of Fergusonite-(Nd) =5.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEFergusonite-(Nd) = 298.37 barns/electron
U=PEFergusonite-(Nd) x relectron=1,356.71 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 40,812.29 (Gamma Ray American Petroleum Institute Units)
Concentration of Fergusonite-(Nd) per GRapi unit = 24.50 (PPM)

Fergusonite-(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) 745.28 ±186.32 grams of pure Fergusonite-(Nd) .

Estimated Radioactivity from Fergusonite-(Nd) - weak
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.21 cm 961,270 2.60E-05 40,812.29 13.42
100 gm / 3.35 cm 96,127 2.60E-06 4,081.23 1.34
10 gm / 1.55 cm 9,613 2.60E-07 408.12 0.13
1 gm / 7.21 mm 961 2.60E-08 40.81 0.01
0.1 gm / 3.35 mm 96 2.60E-09 4.08 0.00
0.01 gm / 1.55 mm 10 2.60E-10 0.41 0.00
0.001 gm / 0.72 mm 1 2.60E-11 0.04 0.00

Weight of pure Fergusonite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.10 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 ( 2.14 % Th) From Sum REE Elements (42.86 % REE)

Fergusonite-(Nd) Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.01)Fergusonite Group (Tetragonal) Fergusonite-(Y) YNbO4 I 41/a 4/m Formanite-(Y) YTaO4 I 41/a 4/m Fergusonite-(Ce)* (Ce,La,Y)NbO4 I 41/a 4/m Fergusonite-(Nd)* (Nd,Ce)(Nb,Ti)O4 I 41/a 4/m
Help on  Strunz Class: Strunz Class: 07.GA.05 07 - SULFATES (SELENATES, TELLURATES)
  07.G - Molybdates, Wolframates and Niobates
  07.GA -Without additional anions or H2O
07.GA.05 Fergusonite-(Ce)* (Ce,La,Y)NbO4 I 41/a 4/m
07.GA.05 Fergusonite-(Nd)* (Nd,Ce)(Nb,Ti)O4 I 41/a 4/m
07.GA.05 Fergusonite-(Y) YNbO4 I 41/a 4/m
07.GA.05 Stolzite PbWO4 I 41/a 4/m
07.GA.05 Scheelite CaWO4 I 41/a 4/m
07.GA.05 Powellite CaMoO4 I 41/a 4/m
07.GA.05 Wulfenite PbMoO4 I 41/a 4/m

Other Fergusonite-(Nd) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.74,p946,1989) OPTIC PROP.(Am.Min.,Vol.74,p946,1989)
Help on See Also: See Also: Links to other databases for Fergusonite-(Nd) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 07.GA.05





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