Tveitite-(Y) Mineral Data

General Tveitite-(Y) Information

Chemical Formula:

Ca1-xYxF2+x, x~0.3

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

Empirical Formula:

Ca_0.7Y_0.3F_2.3

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

PDF 29-364

Tveitite-(Y) Crystallography

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

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

By Intensity(I/I_o): 3.18(1), 1.265(0.8), 1.949(0.7),

Physical Properties of Tveitite-(Y)

Color:

White, Light yellow.

Luminescence:

Fluorescent, Short UV=faint yellow orange.

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Tveitite-(Y)

Optical Data:

Biaxial (-), a=1.476, b=1.479, g=1.481, bire=0.0050

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Tveitite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Tveitite-(Y) =3.87 gm/cc.

Fermion Index:

Fermion Index = 0.0003848067
Boson Index = 0.9996151933

Photoelectric:

PE_Tveitite-(Y)= 37.63 barns/electron
U=PE_Tveitite-(Y) x rElectron Density= 137.31 barns/cc.

Radioactivity:

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

Tveitite-(Y) Classification

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

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

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 :

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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