Formanite-(Y) Mineral Data

Formanite-(Y) Mineral Data +

General Formanite-(Y) Information

Chemical Formula:

YTaO4

Composition:

Molecular Weight = 333.85 gm

Yttrium 26.63 % Y 33.82 % Y₂O₃

Tantalum 54.20 % Ta 66.18 % Ta₂O₅

Oxygen 19.17 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

YTaO₄

IMA Status:

Valid Species (Pre-IMA) 1944

Locality:

Coolegong, New South Wales, Australia Link to MinDat.org Location Data.

Name Origin:

Named for Francis Gloster Forman (1904-1980), government geologist.

Synonym:

ICSD 36076

PDF 26-1478

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Formanite-(Y) Crystallography

Axial Ratios:

a:c = 1:1.47225

Cell Dimensions:

a = 7.75, c = 11.41, Z = 9; V = 685.31 Den(Calc)= 7.28

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): 3.13(1), 2.93(0.9), 1.57(0.7),1.64(0.7), 1.9(0.7), 1.19(0.6), 1.22(0.6), 2.72(0.6),

Physical Properties of Formanite-(Y)

Cleavage:

[111] Indistinct

Color:

Brownish black, Black.

Density:

7.03

Diaphaniety:

Subtranslucent to Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Vitreous - Metallic

Streak:

brown

Optical Properties of Formanite-(Y)

Gladstone-Dale:

CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1538,KPDmeas= 0.1593,KC= 0.1574

Optical Data:

Isotropic, n=2.05-2.19.

Calculated Properties of Formanite-(Y)

Electron Density:

r_electron=6.06 gm/cc
note: r_{Formanite-(Y)}=7.03 gm/cc.

Fermion Index

Fermion Index = 0.00015
Boson Index = 0.99985

Photoelectric:

PE_{Formanite-(Y)}= 683.22 barns/electron
U=PE_{Formanite-(Y)} x r_electron=4,143.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Formanite-(Y) is Not Radioactive

Formanite-(Y) Classification

Dana Class:

8.1.1.2 (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.24-70 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 Formanite-(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 Formanite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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

Formanite-(Y)

YTaO4
Dana No: 8.1.1.2 Strunz No: IV/D.24-70
Locality:

Notes: