Formanite-(Y) Mineral Data

Formanite-(Y) Mineral Data
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General Formanite-(Y) Information

Help on Chemical Formula: Chemical Formula: YTaO4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: YTaO4
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1944
Help on Locality: Locality: Coolegong, New South Wales, Australia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Francis Gloster Forman (1904-1980), government geologist.
Help on Name Pronunciation: Name Pronunciation: Formanite-(Y) + Pronunciation Say FORMANITE-(Y)
Help on Synonym: Synonym: ICSD 36076
  PDF 26-1478
 

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Formanite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.47225
Help on Cell Dimensions: Cell Dimensions: a = 7.75, c = 11.41, Z = 9; V = 685.31 Den(Calc)= 7.28
Help on Crystal System: Crystal System: Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 41/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),
Click Here for Large Formanite-(Y) Structure Window Crystal Structure:

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Wolten G M , Acta Crystallographica , 23 (1967) p.939-944, The structure of the M -phase of YTaO4, a third fergusonite polymorph, Locality: synthetic

 

Physical Properties of Formanite-(Y)

Help on Cleavage: Cleavage: {111} Indistinct
Help on Color: Color: Brownish black, Black.
Help on Density: Density: 7.03
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5.5-6.5 - Knife Blade-Pyrite
Help on Luster: Luster: Vitreous - Metallic
Help on Streak: Streak: brown
 

Optical Properties of Formanite-(Y)

Help on Gladstone-Dale: 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
Ncalc = 2.11 - 2.15
Help on Optical Data: Optical Data: Isotropic, n=2.05-2.19.
 

Calculated Properties of Formanite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.06 gm/cc
note: Specific Gravity of Formanite-(Y) =7.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001570537
Boson Index = 0.9998429463
Help on Photoelectric: Photoelectric: PEFormanite-(Y) = 683.22 barns/electron
U=PEFormanite-(Y) x rElectron Density=4,143.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Formanite-(Y) is Not Radioactive
 

Formanite-(Y) Classification
Help on Dana Class: Dana Class: 08.01.01.02 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.01)Fergusonite Group (Tetragonal)
 
08.01.01.01 Fergusonite-(Y) YNbO4 I 41/a 4/m
 
08.01.01.02 Formanite-(Y) YTaO4 I 41/a 4/m
 
08.01.01.03 Fergusonite-(Ce)* (Ce,La,Y)NbO4 I 41/a 4/m
 
08.01.01.04 Fergusonite-(Nd)* (Nd,Ce)(Nb,Ti)O4 I 41/a 4/m
Help on Strunz Class: Strunz Class: 07.GA.10 07 - SULFATES (SELENATES, TELLURATES)
  07.G - Molybdates, Wolframates and Niobates
  07.GA -Without additional anions or H2O
 
07.GA.10 Formanite-(Y) YTaO4 I 41/a 4/m
 
07.GA.10 Iwashiroite-(Y)! YTaO4 P 2/a 2/m
 

Other Formanite-(Y) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Formanite-(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 - Ruff.Info

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

Formanite-(Y)

YTaO4
Dana No: 08.01.01.02 Strunz No: 07.GA.10
Locality:

 

Notes: