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Eva Verda (Eve Verda; Eau Verte; Fontaine Verte), Servette-Chuc mining complex, Saint-Marcel, Aosta Valley, Italy

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Name(s) in local language(s):Eva Verda (Eve Verda; Eau Verte; Fontaine Verte), Complesso minerario di Servette-Chuc, Saint-Marcel, Valle d'Aosta, Italia


A streamlet that descends from Servette mine and covers with a colloidal blue-green precipitate the rocks and the pebbles of the streambed. The unusual phenomenon can be easily observed at 1322 m in altitude, where the pathway from Plout to the Chuc mining village crosses the streamlet. The blue-green precipitate is made of a mixture of nanocrystalline hydrowoodwardite [previously classified as woodwardite] and amorphous Al and Si oxyhydroxides (Tumiati et al., 2008). It likely precipitates during a change of pH after the mixing of two different streams, one coming from Galleria Ribasso of the Servette mine (1789 m) and the other from the Chuc village (their confluence can be seen a few meters uphill).
This spectacular “fontaine colorée” was firstly described by Saint-Martin de La Motte (1784-85) and later observed by Horace-Bénedict de Saussure, in occasion of his trip to Saint-Marcel valley on 20th August 1792, as reported in his famous “Voyages dans les Alpes” (1796, tome 4).

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3 valid minerals.

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References

Saint-Martin de La Motte, F. (1784-85): Sur la fontaine verte de Saint-Marcel dans la vallée d'Aoste. Mem. R. Acc. Sci. Torino [1], 7, 1-12.

De Saussure, H.B. (1796): Voyages dans les Alpes, précédés d'un essai sur l'histoire naturelle des environs de Genève. Tome 4. Fauche-Borel Ed., Neuchâtel, page 459.

Zinetti, G. (2002): Analisi ambientale del dissesto idrogeologico causato dallo stato di abbandono e di degrado della miniera di Cu e Fe di Servette nel versante destro della bassa valle di Saint-Marcel (AO) e proposta di recupero ambientale. Tesi di Laurea, Università degli Studi dell’Insubria (Como).

Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Amici del Museo "F. Eusebio" di Alba, Ed., 607 pp.

Tumiati, S., Godard, G., Masciocchi, N., Martin, S., Monticelli, D. (2008): Environmental factors controlling the precipitation of Cu-bearing hydrotalcite-like compounds from mine waters. The case of the "Eve verda" spring (Aosta Valley, Italy). European Journal of Mineralogy, 20, 73-94.


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