Fergusonite-(Nd) Mineral Data

Fergusonite-(Nd) Mineral Data +

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General Fergusonite-(Nd) Information

Chemical Formula:

(Nd,Ce)(Nb,Ti)O4

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

Empirical Formula:

Nd_0.3Ce_0.2Fe²⁺_0.2REE_0.3Nb_0.8Ti_0.2O_3.6

Environment:

Rare-earth deposit.

IMA Status:

Not Approved IMA 1987

Locality:

Bayan Obo, Inner Mongolia, China. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and a member of the fergusonite group.

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Fergusonite-(Nd) Crystallography

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4₁/a

Physical Properties of Fergusonite-(Nd)

Cleavage:

[???] Indistinct

Color:

Dark brown.

Density:

4.5 - 5.7, Average = 5.09

Diaphaniety:

Translucent to Opaque

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Adamantine

Streak:

brown

Optical Properties of Fergusonite-(Nd)

Gladstone-Dale:

CI meas= -0.176 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2451,KC= 0.2084

Optical Data:

Uniaxial (-), e=2.2, w=2.3, bire=0.1000.

Calculated Properties of Fergusonite-(Nd)

Electron Density:

r_electron=4.55 gm/cc
note: r_{Fergusonite-(Nd)}=5.10 gm/cc.

Fermion Index

Fermion Index = 0.06888
Boson Index = 0.93112

Photoelectric:

PE_{Fergusonite-(Nd)}= 298.37 barns/electron
U=PE_{Fergusonite-(Nd)} x r_electron=1,356.71 barns/cc.

Radioactivity:

GRapi = 40,812.28 (Gamma Ray American Petroleum Institute Units)

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
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 / 7.21 cm	961,270	2.60E-05	40,812.28	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

Dana Class:

8.1.1.4 (8)Multiple Oxides with Nb, Ta, and Ti

(8.1)where A BO4

(8.1.1)Dana Group

8.1.1.1 Fergusonite-(Y) YNbO4 I 4₁/a 4/m

8.1.1.2 Formanite-(Y) YTaO4 I 4₁/a 4/m

8.1.1.3 Fergusonite-(Ce)* (Ce,La,Y)NbO4 I 4₁/a 4/m

8.1.1.4 Fergusonite-(Nd) * (Nd,Ce)(Nb,Ti)O4 I 4₁/a 4/m

Strunz Class:

IV/D.24-60 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-(Nd) Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.74,p946,1989) OPTIC PROP.(Am.Min.,Vol.74,p946,1989)

See Also:

Links to other databases for Fergusonite-(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 -École des Mines de Paris

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Fergusonite-(Nd)

(Nd,Ce)(Nb,Ti)O4
Dana No: 8.1.1.4 Strunz No: IV/D.24-60
Locality:

Notes: