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Trimouns Talc Mine, Luzenac, Ariège, Midi-Pyrénées, France

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Name(s) in local language(s): Carrière de talc de Trimouns
 
Note Hoshino et al. (2008) have investigated the composition of dissakisite-(Ce)and allanite-(Ce)from this locality, and also publish 10 microprobe analyses from a single crystal. Their conclusion is that: Euhedral dissakisites from Trimouns dolomite mine, France, is compositionally-zoned. Back-scattered electron (BSE) images reveal that each of the described dissakisite crystals has three distinct compositional zones: normal zoned core(Mg-rich), oscillatory zoned middle (Ca-Al-rich) and homogeneous rim (Fe-ΣREE-rich). The latter zone with Fe2+> Mg corresponds to allanite-(Ce). Dissakisite-(Ce) also displays pronounced zoning in Fe/Mg which may suggest that the temperature of crystallization continuously decreased from core to rim. Each individual crystal will probably therefore contain both species. Allanite-(Ce) is generally considered to be darker than dissakisite-(Ce), but this is not a definitive way t distinguish between the minerals.



Mineral List



61 entries listed. 53 valid minerals. 2 (TL) - type locality of valid minerals.

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References

- Favreau, G. (1994): Trimouns, Ariège, Frankreich: Seltenerden-Mineralien aus dem Dolomit. Lapis, 19 (12), 18-39; 58. (in German)
- de Parseval, P., Fontan, F., Aigouy, T. (1997): Composition chimique des minéraux de terres rares de Trimouns (Ariège, France). C. R. Acad. Sc. Paris, 234, Sér. IIa, 625-630.
- Marty, F. (2004). "The Trimouns quarry, Luzenac - Ariège - France." The Mineralogical Record, 35(3), 225-247+274.
- Gatel, P. , Parodi, G. , Parseval (De), P. , Fontan, F. and Marty, F. (2002). "Les minéraux de terres rares à Trimouns." Le Règne Minéral(Hors série 8), 29-63.
- Gatel, P. , Parodi, G. , Parseval (De), P. and Fontan, F. (2002). "Les minéraux de terres rares (T.R.)." Le Règne Minéral(Hors série 8), 20-28.
- Gatel, P. and Marty, F. (2002). "Autres espèces de Trimouns." Le Règne Minéral(Hors série 8), 64-76.
- Gatel, P. (2006). "La trimounsite-(Y) de Trimouns, Luzenac (Ariège)." Le Cahier des Micromonteurs(93), 122-123.
- Mihoko Hoshino, Mitsuyoshi Kimata, Norimasa Nishida & Masahiro Shimizu (2008): Crystal chemical significance of chemical zoning in dissakisite-(Ce). Phys. Chem. Minerals 35, 59-70.

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