Fergusonite-beta-(Y) Mineral Data

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General Fergusonite-beta-(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

Environment:

Granitic rocks.

IMA Status:

Approved IMA 1961

Locality:

Central-eastern Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the crystal symmetry and composition as the Y-dominant member of the fergusonite group.

Name Pronunciation:

Fergusonite-beta-(Y) + Pronunciation

Fergusonite-beta-(Y) Image

Images:

Fergusonite-beta-(Y)

Comments: Black crystal of fergusonite-β-(Y) in matrix.
Location: Fukushima City, Fukushima Prefecture, Japan. Scale: Crystal Size 6 mm.
© Nagashima mineral collection

Fergusonite-beta-(Y) Crystallography

Axial Ratios:

a:b:c =0.4837:1:0.4633

Cell Dimensions:

a = 5.292, b = 10.94, c = 5.069, Z = 4; beta = 94.6° V = 292.52 Den(Calc)= 5.58

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: I2

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

By Intensity(I/I_o): 3.12(1), 2.955(0.95), 1.9(0.75),

Crystal Structure:

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Weitzel H , Schrocke H , Zeitschrift fur Kristallographie , 152 (1980) p.69-82, Kristallstrukturverfeinerungen von euxenit, Y(Nb0.5Ti0.5)2O6, und M-fergusonit, YNbO4

Physical Properties of Fergusonite-beta-(Y)

Color:

Yellow.

Diaphaneity:

Translucent to Opaque

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Vitreous - Greasy

Optical Properties of Fergusonite-beta-(Y)

Gladstone-Dale:

CI calc= 0.096 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2016,KC= 0.223
Ncalc = 2.24

Optical Data:

Biaxial (+/-), a=2.06-2.19, b=2.06-2.19, g=2.06-2.19, bire=0.0000, 2V(Calc)=0, 2V(Meas)=0.

Calculated Properties of Fergusonite-beta-(Y)

Electron Density:

Bulk Density (Electron Density)=5.08 gm/cc
note: Specific Gravity of Fergusonite-beta-(Y) =5.58 gm/cc.

Fermion Index:

Fermion Index = 0.00012497
Boson Index = 0.99987503

Photoelectric:

PE_{Fergusonite-beta-(Y)}= 105.20 barns/electron
U=PE_{Fergusonite-beta-(Y)} x rElectron Density= 534.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fergusonite-beta-(Y) is Not Radioactive

Fergusonite-beta-(Y) Classification

Dana Class:

08.01.02.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.01)where A BO4

(08.01.02)Fergusonite-beta Grup (Monoclinic)

08.01.02.01 Fergusonite-beta-(Y) YNbO4 I2 2

08.01.02.02 Fergusonite-beta-(Ce) (Ce,La,Nd)NbO4 I2 2

08.01.02.03 Fergusonite-beta-(Nd) (Nd,Ce)NbO4 I2 2

Strunz Class:

04.DG.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DG -With large (± medium-sized) cations; chains of edge-sharing octahedra

04.DG.10 Fergusonite-beta-(Nd) (Nd,Ce)NbO4 I2 2

04.DG.10 Fergusonite-beta-(Y) YNbO4 I2 2

04.DG.10 Fergusonite-beta-(Ce) (Ce,La,Nd)NbO4 I2 2

04.DG.10 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m

Other Fergusonite-beta-(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-beta-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Fergusonite-beta-(Y)

YNbO4
Dana No: 08.01.02.01 Strunz No: 04.DG.10
Locality:

Notes: