Fergusonite-(Ce) Mineral Data

Fergusonite-(Ce) Mineral Data +

[New Updates] [Gallery 1] [Gallery 2] [Gallery 3] [Rock Shop Gallery]
Serving the mineral collector and educator community since 1970
Over 900,000 mineral specimens in stock
New minerals acquired weekly - Wright's Rock Shop

General Fergusonite-(Ce) Information

Chemical Formula:

(Ce,La,Y)NbO4

Composition:

Molecular Weight = 296.94 gm

Lanthanum 14.03 % La 16.46 % La₂O₃

Cerium 28.31 % Ce 33.16 % Ce₂O₃

Yttrium 2.99 % Y 3.80 % Y₂O₃

Niobium 31.29 % Nb 44.76 % Nb₂O₅

Hydrogen 0.20 % H 1.82 % H₂O

Oxygen 23.17 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_0.6La_0.3Y_0.1NbO₄·0.3(H₂O)

Environment:

In a carbonatite.

IMA Status:

Not Approved IMA 1986

Locality:

Novopoltavsk massif [Cherigovsky massif, Azov Sea area], Ukraine. Link to MinDat.org Location Data.

Name Origin:

For the relationship to fergusonite-(Y) and the cerium content.

Search for Fergusonite-(Ce) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Fergusonite-(Ce) Crystallography

Axial Ratios:

a:c = 1:1.02514

Cell Dimensions:

a = 5.17, c = 5.3, Z = 2; V = 141.66 Den(Calc)= 6.96

Crystal System:

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.1(1), 1.882(0.9), 1.631(0.5),1.566(0.4), 2.6(0.3), 3.5(0.2), 2.76(0.2),

Physical Properties of Fergusonite-(Ce)

Cleavage:

[???] Indistinct

Color:

Dark red, Black.

Density:

5.48

Diaphaniety:

Translucent to Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Vitreous - Metallic

Streak:

reddish brown

Optical Properties of Fergusonite-(Ce)

Gladstone-Dale:

CI meas= -0.114 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.123 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1796,KPDmeas= 0.2281,KC= 0.2047

Optical Data:

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

Calculated Properties of Fergusonite-(Ce)

Electron Density:

r_electron=4.86 gm/cc
note: r_{Fergusonite-(Ce)}=5.48 gm/cc.

Fermion Index

Fermion Index = 0.00023
Boson Index = 0.99977

Photoelectric:

PE_{Fergusonite-(Ce)}= 268.98 barns/electron
U=PE_{Fergusonite-(Ce)} x r_electron=1,308.53 barns/cc.

Radioactivity:

GRapi = 40,097.08 (Gamma Ray American Petroleum Institute Units)

Fergusonite-(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) 758.58 ±189.64 grams of pure Fergusonite-(Ce) .

**Estimated Radioactivity from Fergusonite-(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 / 7.04 cm	948,539	2.56E-05	40,097.08	13.18
100 gm / 3.27 cm	94,854	2.56E-06	4,009.71	1.32
10 gm / 1.52 cm	9,485	2.56E-07	400.97	0.13
1 gm / 7.04 mm	949	2.56E-08	40.10	0.01
0.1 gm / 3.27 mm	95	2.56E-09	4.01	0.00
0.01 gm / 1.52 mm	9	2.56E-10	0.40	0.00
0.001 gm / 0.70 mm	1	2.56E-11	0.04	0.00

Weight of pure Fergusonite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.48 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 ( 2.12 % Th) From Sum REE Elements (42.35 % REE)

Fergusonite-(Ce) Classification

Dana Class:

8.1.1.3 (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.24-50 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-(Ce) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.74,p946,1989) OPTIC PROP.(Am.Min.,Vol.74,p946,1989)

See Also:

Links to other databases for Fergusonite-(Ce) :
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

Search for Fergusonite-(Ce) using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Fergusonite-(Ce) :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Fergusonite-(Ce) Mineral Data :

Ask about Fergusonite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Fergusonite-(Ce)

(Ce,La,Y)NbO4
Dana No: 8.1.1.3 Strunz No: IV/D.24-50
Locality:

Notes: