Tveitite-(Y) Mineral Data

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

Help on Chemical Formula: Chemical Formula: Ca1-xYxF2+x, x~0.3
Help on Composition: Composition: Molecular Weight = 98.42 gm
   Calcium   28.50 %  Ca   39.88 % CaO
   Yttrium   27.10 %  Y    34.41 % Y2O3
   Fluorine  44.40 %  F    44.40 % F
               -   %   F   -18.69 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.7Y0.3F2.3
Help on Environment: Environment: In pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Hoydalen, Telmark, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Peder Tveit (1909-1978), Norwegian miner, who found it in his quarry.
Help on Name Pronunciation: Name Pronunciation: Tveitite-(Y) Say TVEITITE-(Y)
Help on Synonym: Synonym: ICSD 35143
  PDF 29-364
 

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Tveitite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.0079:1:1.4189
Help on Cell Dimensions: Cell Dimensions: a = 3.924, b = 3.893, c = 5.524, Z = 2; beta = 90.27° V = 84.38 Den(Calc)= 3.87
Help on Crystal System: Crystal System: MonoclinicSpace Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.18(1), 1.265(0.8), 1.949(0.7),
Click Here for Large Tveitite-(Y) Structure Window Crystal Structure:

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Bevan D J M , Strahle J , Greis O , Journal of Solid State Chemistry , 44 (1982) p.75-81, The crystal structure of tveitite, an ordered yttrofluorite mineral, Note: a and b adjusted to match reported bond lengths

 

Physical Properties of Tveitite-(Y)

Help on Color: Color: White, Light yellow.
Help on Luminescence: Luminescence: Fluorescent, Short UV=faint yellow orange.
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: white
 

Optical Properties of Tveitite-(Y)

Help on Optical Data: Optical Data: Biaxial (-), a=1.476, b=1.479, g=1.481, bire=0.0050
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Tveitite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Tveitite-(Y) =3.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003848067
Boson Index = 0.9996151933
Help on Photoelectric: Photoelectric: PETveitite-(Y) = 37.63 barns/electron
U=PETveitite-(Y) x rElectron Density= 137.31 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tveitite-(Y) is Not Radioactive
 

Tveitite-(Y) Classification
Help on Dana Class: Dana Class: 09.02.01.03 (09)Anhydrous and Hydrated Halides
  (09.02)where A (X)2
  (09.02.01)Fluorite Group
 
09.02.01.01 Fluorite CaF2 F m3m 4/m 3 2/m
 
09.02.01.02 Frankdicksonite BaF2 F m3m 4/m 3 2/m
 
09.02.01.03 Tveitite-(Y) Ca1-xYxF2x,x~0.3 Unk Mono
 
09.02.01.04 IMA2009-014 SrF2 F m3m 4/m 3 2/m
Help on Strunz Class: Strunz Class: 03.AB.30 03 - HALIDES
  03.A - Simple Halides, Without H2O
  03.AB -M:X = 1:2
 
03.AB.30 Tveitite-(Y) Ca1-xYxF2x,x~0.3 Unk Mono
 

Other Tveitite-(Y) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tveitite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Tveitite-(Y)

Ca1-xYxF2+x, x~0.3
Dana No: 09.02.01.03 Strunz No: 03.AB.30
Locality:

 

Notes: