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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): 42.80444,1.80250
Area:24 km2
Köppen climate type:Cfb : Temperate oceanic climate
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.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

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

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Early Jurassic
174.1 - 201.3 Ma

ID: 3149231
mostly detrital deposit

Age: Early Jurassic (174.1 - 201.3 Ma)

Lithology: Major:{sandstone}, Minor{siltstone,dolomite/dolostone,conglomerate}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

358.9 - 419.2 Ma

ID: 3190260
Paleozoic sedimentary rocks

Age: Devonian (358.9 - 419.2 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
- 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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