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About Tveitite-(Y)Hide

John P. Tveit
(Y, Na)6Ca6Ca6(Ca,Na)F42
White to pale yellow
Specific Gravity:
Crystal System:
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)Hide

Approval Year:

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

2 : AX2

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

Physical Properties of Tveitite-(Y)Hide

White to pale yellow
3.94 g/cm3 (Measured)    3.99 g/cm3 (Calculated)

Optical Data of Tveitite-(Y)Hide

Biaxial (-)
RI values:
nα = 1.476 nβ = 1.479 nγ = 1.481
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:
r < v moderate

Chemical Properties of Tveitite-(Y)Hide

(Y, Na)6Ca6Ca6(Ca,Na)F42
IMA Formula:

Crystallography of Tveitite-(Y)Hide

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

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0013486Tveitite-(Y)Bevan D J M, Strahle J, Greis O (1982) The crystal structure of tveitite, an ordered yttrofluorite mineral Journal of Solid State Chemistry 44 75-8119820293
CIF Raw Data - click here to close

Type Occurrence of Tveitite-(Y)Hide

Geological Setting of Type Material:
Pegmatite dikes

Synonyms of Tveitite-(Y)Hide

Other Language Names for Tveitite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Tveitite-(Y) associated with Kamphaugite-(Y)Ca(Y,REE)(CO3)2(OH) · H2O
1 photo of Tveitite-(Y) associated with Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)

Related Minerals - Nickel-Strunz GroupingHide

3.AB.FluorocronitePbF2Iso. m3m (4/m 3 2/m) : Fm3m
3.AB.15SellaiteMgF2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
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.35Polezhaevaite-(Ce)NaSrCeF6Hex. 6/m : P63/m

Related Minerals - Dana Grouping (8th Ed.)Hide m3m (4/m 3 2/m) : Fm3m 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.
  • 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
Stensrud, S. (2009): De opptredende mineraler på granittpegmatittganger i Iveland og Evje. Unpublished paper based on 4 previous papers written together with Johan Løchen.
  • 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).
  • Murmansk Oblast
    • Lovozersky District
      • 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.
  • Zabaykalsky Krai
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.; Savel’eva, V. B., Bazarova, E. P., Khromova, E. A., & Kanakin, S. V. (2017). Fluorides and Fluorcarbonates in Rocks of the Katugin Complex, Eastern Siberia: Indicators of Geochemical Mineral Formation Conditions. Geology of Ore Deposits, 59(7), 561-574.; E. V. Sklyarov, D. P. Gladkochub, A. B. Kotov, A. E. Starikova, V. V. Sharygin, S. D. Velikoslavinsky, A. M. Larin, A. M. Mazukabzov, E. V. Tolmacheva, E. A. Khromova (2016): Genesis of the Katugin rare-metal ore deposit: Magmatism versus metasomatism. Russian Journal of Pacific Geology 10, 155–167.; Starikova, A. E., Bazarova, E. P., Savel’eva, V. B., Sklyarov, E. V., Khromova, E. A., & Kanakin, S. V. (2019) Pyrochlore-Group Minerals in the Granite-Hosted Katugin Rare-Metal Deposit, Transbaikalia, Russia. Minerals, 9(8), 490.
  • Community of 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
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.
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