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Tveitite-(Y) Mineral Data
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General Tveitite-(Y) Information
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 Chemical Formula: |
Ca1-xYxF2+x, x~0.3 |
| Composition: |
Molecular Weight = 98.42 gm |
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Calcium 28.50 % Ca 39.88 % CaO |
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Yttrium 27.10 % Y 34.41 % Y2O3 |
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Fluorine 44.40 % F 44.40 % F |
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- %
F -18.69 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.7Y0.3F2.3 |
| Environment: |
In pegmatites. |
| IMA Status: |
Approved IMA 1977 |
| Locality: |
Hoydalen, Telmark, Norway. Link to MinDat.org Location Data. |
| Name Origin: |
Named for John Peder Tveit (1909-1978), Norwegian miner, who found it in his quarry. |
| Name Pronunciation: |
Tveitite-(Y)  |
| Synonym: |
ICSD 35143 |
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PDF 29-364 |
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Tveitite-(Y) Crystallography
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| Axial Ratios: |
a:b:c =1.0079:1:1.4189 |
| Cell Dimensions: |
a = 3.924, b = 3.893, c = 5.524, Z = 2; beta = 90.27° V = 84.38 Den(Calc)= 3.87 |
| Crystal System: |
Monoclinic Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 3.18(1), 1.265(0.8), 1.949(0.7), |
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Physical Properties of Tveitite-(Y)
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| Color: |
White, Light yellow. |
| Luminescence: |
Fluorescent, Short UV=faint yellow orange. |
| Luster: |
Greasy (Oily) |
| Streak: |
white |
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Optical Properties of Tveitite-(Y)
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| Optical Data: |
Biaxial (-), a=1.476, b=1.479, g=1.481, bire=0.0050 |
| Pleochroism (x): |
colorless. |
| Pleochroism (y): |
colorless. |
| Pleochroism (z): |
colorless. |
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Calculated Properties of Tveitite-(Y)
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| Electron Density: |
Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Tveitite-(Y) =3.87 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0003848067
Boson Index = 0.9996151933 |
| Photoelectric: |
PETveitite-(Y) = 37.63 barns/electron
U=PETveitite-(Y) x rElectron Density= 137.31 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tveitite-(Y) is Not Radioactive |
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Tveitite-(Y) Classification
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| Dana Class: |
09.02.01.03 (09)Anhydrous and Hydrated Halides |
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(09.02)where A (X)2 |
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(09.02.01)Fluorite Group |
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09.02.01.01 Fluorite CaF2 F m3m 4/m 3 2/m |
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09.02.01.02 Frankdicksonite BaF2 F m3m 4/m 3 2/m |
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09.02.01.03 Tveitite-(Y) Ca1-xYxF2x,x~0.3 Unk Mono |
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09.02.01.04 IMA2009-014 SrF2 F m3m 4/m 3 2/m |
| Strunz Class: |
03.AB.30 03 - HALIDES |
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03.A - Simple Halides, Without H2O |
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03.AB -M:X = 1:2 |
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03.AB.30 Tveitite-(Y) Ca1-xYxF2x,x~0.3 Unk Mono |
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Other Tveitite-(Y) Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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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Print or Cut-and-Paste your Tveitite-(Y) Specimen Label here :
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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:
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