Fergusonite-(Y) Mineral Data

Fergusonite-(Y) Mineral Data +

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General Fergusonite-(Y) Information

Chemical Formula:

YNbO4

Composition:

Molecular Weight = 245.81 gm

Yttrium 36.17 % Y 45.93 % Y₂O₃

Niobium 37.80 % Nb 54.07 % Nb₂O₅

Oxygen 26.04 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

YNbO₄

IMA Status:

Valid Species (Pre-IMA) 1827

Locality:

Qeqertaussaq, Julienhaab district, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for Robert Ferguson (1767-1840), Scottish advocate, politician, and mineralogist.

Synonym:

ICSD 40346

PDF 9-443

Fergusonite-(Y) Image

Images:

Fergusonite-(Y)

Comments: Heavy mass of fergusonite-(Y) with one face polished flat to show the solid interior. Radioactive.
Location: Ambatofotsy, Betafo - Antsirab? region, Antananarivo Province, Madagascar. Scale: 6x2.5x1.5 cm.
© John Betts - Fine Minerals

Fergusonite-(Y) Crystallography

Axial Ratios:

a:c = 1:1.46511

Cell Dimensions:

a = 7.74, c = 11.34, Z = 8; V = 679.35 Den(Calc)= 4.81

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): 3.12(1), 2.96(0.9), 1.901(0.5),

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Forms: [ 1 1 1] [ 2 3 1] [ 2 3 0] [ 0 0 1]

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Physical Properties of Fergusonite-(Y)

Cleavage:

[???] Indistinct

Color:

Black, Black, Brown, Gray, Yellow.

Density:

4.3 - 5.8, Average = 5.05

Diaphaniety:

Subtranslucent to opaque

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Habit:

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

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Magnetism:

Nonmagnetic

Streak:

brown

Optical Properties of Fergusonite-(Y)

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2328,KPDmeas= 0.2218,KC= 0.223

Optical Data:

Isotropic, n=2.05-2.19.

Calculated Properties of Fergusonite-(Y)

Electron Density:

r_electron=4.60 gm/cc
note: r_{Fergusonite-(Y)}=5.05 gm/cc.

Fermion Index

Fermion Index = 0.00012
Boson Index = 0.99988

Photoelectric:

PE_{Fergusonite-(Y)}= 105.20 barns/electron
U=PE_{Fergusonite-(Y)} x r_electron= 484.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fergusonite-(Y) is Not Radioactive

Fergusonite-(Y) Classification

Dana Class:

8.1.1.1 (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.24-40 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-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Fergusonite-(Y) :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Fergusonite-(Y)

YNbO4
Dana No: 8.1.1.1 Strunz No: IV/D.24-40
Locality:

Notes: