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Tveitite-(Y)

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Birkeland, Iveland, Aust-Agder, Norway
© Knut Eldjarn

Show Tveitite-(Y) Photos (6)



Formula:
(Y, Na)
 
6
Ca
 
6
Ca
 
6
F
 
42
System:TrigonalColour:White to pale yellow
Name:
Name after John P. Tveit (1909 - 1978), quarry owner of Høydalen, Telemark (Norway).
This page provides mineralogical data about Tveitite-(Y).

Classification of Tveitite-(Y)

IMA status:Approved 1975
Strunz 8th edition ID:3/A.08-30
Nickel-Strunz 10th (pending) edition ID:3.AB.30

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
Dana 8th edition ID:9.2.1.3

9 : NORMAL HALIDES
2 : AX2
Hey's CIM Ref.:8.7.3

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
7 : Halides of the rare earth metals
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Type Occurrence of Tveitite-(Y)

Type Locality:Høydalen (Høydalen seter), Tørdal, Drangedal, Telemark, Norway
Geological Setting of type material:Pegmatite dikes

Physical Properties of Tveitite-(Y)

Lustre:Greasy
Diaphaneity (Transparency):Transparent
Colour:White to pale yellow
Density (measured):3.94 g/cm3
Density (calculated):3.99 g/cm3

Crystallography of Tveitite-(Y)

Crystal System:Trigonal
Class (H-M):3 - Rhombohedral
Space Group:R3
Cell Parameters:a = 17.02(2) Å, c = 9.679(2) Å
Ratio:a:c = 1 : 0.569
Unit Cell Volume:V 2428.2 ų
Z:18
Twinning:Complex, polysynthetic, forming three dimensional grating of spindles

Optical Data of Tveitite-(Y)

Type:Biaxial (-)
RI values: nα = 1.476 nβ = 1.479 nγ = 1.481
2V:Measured: 34°
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v moderate

Chemical Properties of Tveitite-(Y)

Formula:
(Y, Na)
 
6
Ca
 
6
Ca
 
6
F
 
42
Essential elements:Ca, F, Y
All elements listed in formula:Ca, F, Na, Y

Relationship of Tveitite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.AB.05Tolbachite
CuCl
 
2
3.AB.10Coccinite
HgI
 
2
3.AB.15Sellaite
MgF
 
2
3.AB.20Chloromagnesite
MgCl
 
2
3.AB.20Lawrencite
(Fe
2+
 
,Ni)Cl
 
2
3.AB.20Scacchite
MnCl
 
2
3.AB.25Fluorite
CaF
 
2
3.AB.25Frankdicksonite
BaF
 
2
3.AB.25IMA2009-014
SrF
 
2
3.AB.35Gagarinite-(Y)
NaCaYF
 
6
3.AB.35Gagarinite-(Ce)
Na(REE
 
x
Ca
 
1-x
)(REE
 
y
Ca
 
1-y
)F
 
6
3.AB.35Polezhaevaite-(Ce)
NaSrCeF
 
6
Related Minerals - Hey's Index Grouping:

- +
8.7.1Fluocerite-(Ce)
(Ce,La)F
 
3
8.7.2Fluocerite-(La)
(La,Ce)F
 
3
8.7.4Gagarinite-(Y)
NaCaYF
 
6

Other Names for Tveitite-(Y)

Synonyms:
IMA1975-033
Other Languages:
German:Tveitit-(Y)
Russian:Твейтит-(Y)

Other Information

Fluorescence in UV light:Faint yellow-orange in SW
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tveitite-(Y)

Reference List:

- +
Lithos (1977), 10, 81-87.

American Mineralogist (1977): 62: 1060.

Journal of Solid State Chemistry (1982): 44: 75-81.

Yakubovich, O.V. et al.: "Crystal structure of tveitite-(Y): fractionation of rare-earth elements between positions and the variey of defects" : Crystallography Reports 52, 71(2007)

Internet Links for Tveitite-(Y)

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    • Localities for Tveitite-(Y)

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Norway
     
    • Aust-Agder
      • Iveland
        • Birkeland
    		Neumann (1985) : Norges mineraler. Norges geologiske undersøkelse Skrifter 68, p. 51 / Frigstad, O. F. (1999): Amazonittpegmatitter i Iveland-Evje. Bergverksmuseets Skrift 15: 60-73
    • Telemark
      • Drangedal
        • Tørdal
    		Bergstøl, S.; Jensen, B.B. & Neumann, H. (1977): Tveitite, a new calcium yttrium fluoride. LITHOS 10: 81-87; Greis (1978); Bevan et al. (1980); Neumann (1985, p. 51).
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola peninsula
          • Western Keivy Massif
    		P.M. Kartashov data
    USA
     
    Leonard S.Wiener and Sigrid Ballew,1995, Updated by Kenny Gay,2006, A Listing Of North Carolina Minerals,Geologic Note No.4
    • Texas
      • Llano Co.
        • Bluffton
    		MinRec 9(6):387
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