Granite massif ('massif des Colettes') E and NE of Echassières with three highly evolved granites (Beauvoir granite, Colettes granite and La Bosse granite) and associated greisen (some with Sn), pegmatites, hydrothermal veins (mainly W) and kaolinisation.
Several, mostly abandoned quarries and workings on mineralised veins.
Some of the mineralisations were already exploited during Gallic-Roman times.
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References
- Nicolas, J. & de Rosen, A. (1963): Le massif granitique des Colettes (Allier) et ses mineralizations. Bulletin de la Société Française de Minéralogie et de Cristallographie 86, 126-128.
- NICOLAS, J. & de ROSEN, A. (1963): Phosphates hydrothermaux de basse température et kaolinisation: la gorceixite du massif des Colettes (Allier) et les minéraux associes (hinsdalite). Bull. Soc. Franç. Minér. Cristallogr., 86, 379-385.
- DE ROSEN, A. (1965): Évolution continue d'un massif granitique et succession minérale : le massif des Colettes (Échassieres, Allier). Première partie : Granites et micaschistes. Bulletin de la Société Française de Minéralogie et de Cristallographie, 88, 678-687.
- DE ROSEN, A. (1966): Évolution continue d'un massif granitique et succession minérale: le massif des Colettes (Échassières, Allier). Deuxième partie: filons, altérations et minéralisations. – Bull. Minéral. Franç. Minéral. Cristallogr., 89, 155-176.
- Aubert, G. (1969): Les coupoles granitiques de Montebras et d'Echassières (Massif Central Français) et la genèse de leurs minéralisations en étain, lithium, tungstène et béryllium. Mémoires du BRGM N°46, 345 pp.
- Merceron T., Inoue A., Bouchet A., Meunier A. (1988): Lithium-bearing donbassite and tosudite from Echassieres, Massif Central, France. Clays and Clay Minerals, 36, 39-46.
- RAIMBAULT, L., CUNEY, M., AZENCOTT, C., DUTHOU, J.-L. & JORON, J. L. (1995): Geochemical evidence for a multistage magmatic genesis of Ta-Sn-Li mineralization in the granite at Beauvoir, French Massif Central. Economic Geology, 90, 548-576.
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