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Tveitite-(Y)

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John P. Tveit
Formula:
(Y, Na)6Ca6Ca6F42
Colour:
White to pale yellow
Lustre:
Greasy
Specific Gravity:
3.94
Crystal System:
Trigonal
Name:
Name after John P. Tveit (1909 - 1978), quarry owner of Høydalen, Telemark (Norway).
This page provides mineralogical data about Tveitite-(Y).


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Classification of Tveitite-(Y)Hide

Approved
Approval Year:
1975
3.AB.30

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
9.2.1.3

9 : NORMAL HALIDES
2 : AX2
8.7.3

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
7 : Halides of the rare earth metals

Physical Properties of Tveitite-(Y)Hide

Greasy
Transparency:
Transparent
Colour:
White to pale yellow
Density:
3.94 g/cm3 (Measured)    3.99 g/cm3 (Calculated)

Optical Data of Tveitite-(Y)Hide

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

Formula:
(Y, Na)6Ca6Ca6F42
IMA Formula:
(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42

Crystallography of Tveitite-(Y)Hide

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 V:
2428.2 ų
Z:
18
Twinning:
Complex, polysynthetic, forming three dimensional grating of spindles

Type Occurrence of Tveitite-(Y)Hide

Synonyms of Tveitite-(Y)Hide

Other Language Names for Tveitite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kamphaugite-(Y)1 photo of Tveitite-(Y) associated with Kamphaugite-(Y) on mindat.org.
Clinozoisite1 photo of Tveitite-(Y) associated with Clinozoisite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.AB.FluorocronitePbF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.05TolbachiteCuCl2Mon.
3.AB.10CocciniteHgI2Tet.
3.AB.15SellaiteMgF2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
3.AB.20ChloromagnesiteMgCl2Hex.
3.AB.20Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m
3.AB.20ScacchiteMnCl2Trig. 3m (3 2/m) : R3m
3.AB.25FluoriteCaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25FrankdicksoniteBaF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.25StrontiofluoriteSrF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.35Gagarinite-(Y)NaCaYF6Hex. 6/m : P63/m
3.AB.35Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6Trig.
3.AB.35Polezhaevaite-(Ce)NaSrCeF6Hex. 6/m : P63/m

Related Minerals - Dana Grouping (8th Ed.)Hide

9.2.1.1FluoriteCaF2Iso. m3m (4/m 3 2/m) : Fm3m
9.2.1.4StrontiofluoriteSrF2Iso. m3m (4/m 3 2/m) : Fm3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.7.1Fluocerite-(Ce)(Ce,La)F3Trig. 3m (3 2/m) : P3c1
8.7.2Fluocerite-(La)(La,Ce)F3Trig. 3m (3 2/m) : P3c1
8.7.4Gagarinite-(Y)NaCaYF6Hex. 6/m : P63/m

Fluorescence of Tveitite-(Y)Hide

Faint yellow-orange in SW

Other InformationHide

Health Risks:
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)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bergstøl, S., Jensen, B.B., Neumann, H. (1977) Tveitite, a new calcium yttrium fluoride. Lithos, 10, 81-87.
Fleischer, M., Pabst, A., Mandarino, J.A., Chao, G.Y. (1977) New Mineral Names. American Mineralogist, 62, 1057-1061.
Journal of Solid State Chemistry (1982): 44: 75-81.
Yakubovich, O.V. et al (2007) Crystal structure of tveitite-(Y): fractionation of rare-earth elements between positions and the variey of defects. Crystallography Reports, 52, 71.

Internet Links for Tveitite-(Y)Hide

Localities for Tveitite-(Y)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Norway
 
  • Aust-Agder
    • Iveland
      • Birkeland
Frigstad, O.F. 1968: En undersøkelse av cleavelanditsonerte pegmatittganger i Iveland-Evje, nedre Setesdal. PhD thesis, University of Oslo.
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
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Chitinskaya Oblast'
Victor V. Sharygin analytycal data (2012); Sharygin, V. V., & Vladykin, N. V. (2014). Mineralogy of cryolite rocks from the Katugin massif, Transbaikalia, Russia. Abstract Book of 30th International Conference on “Ore Potential of Alkaline, Kimberlite and Carbonatite Magmatism,” Antalya, Turkey, 166-168.
  • Northern Region
    • Murmanskaya Oblast'
      • Keivy Mountains
        • Western Keivy Massif
P.M. Kartashov data
Pekov, I.V., Chukanov, N.V., Kononkova, N.N., Yakubovich, O.V., Massa, W., Voloshin, A.V. (2008): Tveitite-(Y) and rare-earth enriched fluorite from amazonite pegmatites of Western Keivy, Kola Peninsula, Russia. Genetic crystal-chemistry of natural Ca,REE-fluorides. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 137(3), 76-93.
Spain
 
  • Madrid
Tanago, J. G., Lozano, P. L., Larios, A. , La Iglesia, A. (2012) Stokesite crystals from La Cabrera, Madrid, Spain. Mineralogical Record 43:499-508
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
Crook, W. B. (1978): Tveitite from the Barringer Hill District, Texas. Mineralogical Record. 9(6): 387.
Mineral and/or Locality  
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