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Trimouns Talc Mine, Luzenac, Ariège, Occitanie, France

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Latitude & Longitude (WGS84): 42° 48' 15'' North , 1° 48' 9'' East
Latitude & Longitude (decimal): 42.8044444444, 1.8025
Area:24 km2
Name(s) in local language(s):Carrière de talc de Trimouns
Other/historical region names associated with this locality:Midi-Pyrénées

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 to distinguish between the minerals.

Mineral List

52 valid minerals. 2 (TL) - type locality of valid minerals.

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- 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.
- Hoshino, M., Kimata, M., Nishida, N., Shimizu, M. (2010): Dissakisite-(Ce) chemical composition: some implications for its origin. Phys. Chem. Minerals 37, 255-263.

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