Tveitite-(Y)
A valid IMA mineral species
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About Tveitite-(Y)
John P. Tveit
Formula:
(Y, Na)6Ca6Ca6(Ca,Na)F42
Colour:
White to pale yellow
Lustre:
Greasy
Specific Gravity:
3.94
Crystal System:
Trigonal
Name:
Originally named tveitite, in honor of John P. Tveit (1909 - 1978), quarry owner of Høydalen, Telemark, Norway. He found the first sample. The suffix was added in 1987 by the International Mineralogical Association to conform to new naming rules regarding the dominant rare-earth element (REE). Regarding pronunciation, the name Tveit rhymes with 'late'.
Type Locality:
This page provides mineralogical data about Tveitite-(Y).
Unique Identifiers
Mindat ID:
4066
Long-form identifier:
mindat:1:1:4066:8
IMA Classification of Tveitite-(Y)
Approved
IMA Formula:
(Y,Na)6(Ca,Na,REE)12(Ca,Na)F42
Approval year:
1975
First published:
1977
Classification of Tveitite-(Y)
3.AB.30
3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
9.2.1.3
9 : NORMAL HALIDES
2 : AX2
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
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
7 : Halides of the rare earth metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Ttt-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Tveitite-(Y)
Greasy
Transparency:
Transparent
Colour:
White to pale yellow
Density:
3.94 g/cm3 (Measured) 3.99 g/cm3 (Calculated)
Optical Data of Tveitite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.476 nβ = 1.479 nγ = 1.481
2V:
Measured: 34°
Max. Birefringence:
δ = 0.005
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
r < v moderate
Chemistry of Tveitite-(Y)
Mindat Formula:
(Y, Na)6Ca6Ca6(Ca,Na)F42
Element Weights:
Elements listed:
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 V:
2428.2 ų
Z:
18
Twinning:
Complex, polysynthetic, forming three dimensional grating of spindles
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0013486 | Tveitite-(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 75-81 | 1982 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.184 Å | (100) |
| 2.764 Å | (50) |
| 1.963 Å | (50) |
| 1.949 Å | (70) |
| 1.664 Å | (60) |
| 1.265 Å | (80) |
Comments:
Høydalen, Vestfold og Telemark, Norway. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Tveitite-(Y)
General Appearance of Type Material:
Irregular lump. Altered on the surface and in cracks to kainosite. Contains inclusions of a gadolinite group mineral.
Place of Conservation of Type Material:
Type material (one sample l0xlOx5 cm) is at the Geological Museum, University of Oslo, Norway.
Geological Setting of Type Material:
Pegmatite dikes
Associated Minerals at Type Locality:
Synonyms of Tveitite-(Y)
Other Language Names for Tveitite-(Y)
German:Tveitit-(Y)
Russian:Твейтит-(Y)
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Tveitite-(Y) associated with Kamphaugite-(Y) | Ca(Y,REE)(CO3)2(OH) · H2O |
| 2 photos of Tveitite-(Y) associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 3.AB. | Manuelarossiite | PbCaAlF7 |
| 3.AB. | Fluorocronite | PbF2 |
| 3.AB.05 | Tolbachite | CuCl2 |
| 3.AB.10 | Coccinite | HgI2 |
| 3.AB.15 | Sellaite | MgF2 |
| 3.AB.20 | Lawrencite | (Fe2+,Ni)Cl2 |
| 3.AB.20 | Scacchite | MnCl2 |
| 3.AB.20 | Chloromagnesite | MgCl2 |
| 3.AB.25 | Fluorite | CaF2 |
| 3.AB.25 | Frankdicksonite | BaF2 |
| 3.AB.25 | Strontiofluorite | SrF2 |
| 3.AB.35 | Gagarinite-(Y) | NaCaYF6 |
| 3.AB.35 | Polezhaevaite-(Ce) | NaSrCeF6 |
| 3.AB.35 | Gagarinite-(Ce) | Na(REExCa1-x)(REEyCa1-y)F6 |
| 3.AB.37 | Calcioaravaipaite | PbCa2AlF9 |
| 3.AB.85 | Cotunnite | PbCl2 |
Fluorescence of Tveitite-(Y)
Faint yellow-orange in SW
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Tveitite-(Y)
mindat.org URL:
https://www.mindat.org/min-4066.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
References for Tveitite-(Y)
Reference List:
Fleischer, Michael, Pabst, Adolf, Mandarino, J. A., Chao, George Y. (1977) New mineral names. American Mineralogist, 62 (9-10) 1057-1061
Bergstøl, Sveinung, Jensen, Brenda B., Neumann, Henrich (1977) Tveitite, a new calcium yttrium fluoride. Lithos, 10 (1) 81-87 doi:10.1016/0024-4937(77)90033-0
GREIS, O. (1979) ChemInform Abstract: POWDER X-RAY STUDIES AND SINGLE CRYSTAL ELECTRON DIFFRACTION ON TVEITITE CA13+Δ(Y, RE)6-ΔF44-Δ. Chemischer Informationsdienst, 10 (23) doi:10.1002/chin.197923001
Bevan, D.J.M., Strähle, J., Greis, O. (1982) The crystal structure of tveitite, an ordered yttrofluorite mineral. Journal of Solid State Chemistry, 44. 75-81 doi:10.1016/0022-4596(82)90402-9
Nickel, Ernest H., Mandarino, Joseph A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist, 72 (9-10) 1031-1042
Yakubovich, O. V., Massa, W., Pekov, I. V., Gavrilenko, P. G. (2007) Crystal structure of tveitite-(Y): Fractionation of rare-earth elements between positions and the variety of defects. Crystallography Reports, 52 (1) 71-79 doi:10.1134/s1063774507010087
Pekov, I. V., Chukanov, N. V., Kononkova, N. N., Yakubovich, O. V., Massa, W., Voloshin, A. V. (2009) Tveitite-(Y) and REE-enriched fluorite from amazonite pegmatites of the Western Keivy, Kola Peninsula, Russia: Genetic crystal chemistry of natural Ca,REE-fluorides. Geology of Ore Deposits, 51 (7) 595-607 doi:10.1134/s1075701509070083
Localities for Tveitite-(Y)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Norway | |
| Frigstad (1968) |
| Neumann (1985) +1 other reference | |
| Stensrud (2009) | |
| Bergstøl et al. (1977) +3 other references |
Russia | |
| Pavel.M. Kartashov (n.d.) |
| Pekov et al. (2008) | |
| Victor V. Sharygin analytycal data (2012) +4 other references |
Spain | |
| Tánago et al. (2012) |
USA | |
| Leonard S.Wiener and Sigrid Ballew | |
| Crook (1978) |
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Birkeland 03 Feldspar Quarry, Birkeland, Iveland, Agder, Norway