Donate now to keep alive!Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
The most common minerals on earthMineral PhotographyThe Elements and their Minerals
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Prabornaz Mine (Praborna Mine), Saint-Marcel, Aosta Valley, Italy

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): 45° 40' 45'' North , 7° 26' 57'' East
Latitude & Longitude (decimal): 45.67944,7.44944
Other regions containing this locality:The Alps, Europe
Köppen climate type:ET : Tundra
Name(s) in local language(s):Miniera di Prabornaz, Saint-Marcel, Valle d'Aosta, Italia

The manganese concentrations of Prabornaz are restricted to a 4x8 m thick quartzite unit of diverse lithologies which represent the basal part of the sedimentary cover of an ophiolite suite. Together they constituted the Piedmont Nappe which was metamorphosed up to the eclogite facies in Cretaceous times and was retrogressed in the early Tertiary.

The quartzite unit is composed of a succession of siliceous levels characterized by Mn-bearing minerals reflecting differences in chemical composition and oxygen fugacity inherited from the original sediments. The parageneses evolved during the polyphasic Alpine metamorphism passing through a pre-eclogite blue-schist facies event, the main eclogite facies event, and the several post-eclogite stages terminating in the greenschist facies.

These Mn concentrations were subsequently penetrated by several networks of cross-cutting veins and late fractures which were responsible for the mobilization of certain elements, in particular K, Sr and Ba.

Mineral List

65 valid minerals. 4 (TL) - type locality of valid minerals. 2 (FRL) - first recorded locality of unapproved mineral/variety/etc.

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

66 - 145 Ma

ID: 1378122
Cretaceous volcanic rocks

Age: Cretaceous (66 - 145 Ma)

Comments: May include hypabyssal intrusions.

Lithology: Volcanic rocks

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

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)
- Rondolino R. (1934) Sopra alcuni minerali di S. Marcel (Valle d'Aosta). Periodico di Mineralogia – Roma 123-139.
- Rondolino R. (1936) Sopra alcuni anfiboli manganesiferi di Praborna (San Marcel, Valle d'Aosta). Periodico di Mineralogia – Roma pp. 109-121.
- Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1021.
- Bondi, M., Mottana, A., Kurat, G. & Rossi, G. (1978): Cristallochimica del violano e della schefferite di St. Marcel (Valle d'Aosta). Rendiconti della Società Italiana di Mineralogia e Petrologia, 34, 15-25.
- Brown, P., Essene, E. J. & Peacor, D. R. (1978): The mineralogy and petrology of manganese-rich rocks from St. Marcel, Piedmont, Italy. Contrib. Mineral. Petrol. 67, 227-232.
- Mottana, A., Rossi, G., Kracher, A., & Kurat, G. (1979). Violan revised: Mn bearing Omphacite and Diopside. Tschermaks Min. Petr. Mitt., 26, 187-210.
- Martin, S. (1983): La mine de Praborna, Val d'Aoste (Italie): une série manganesifère metamorphoisée das la facies éclogite. These 3me cycle, Univ. Paris VI, xx pp.
- Martin-Vernizzi, S. (1984) La mine de Praborna (Val d'Aoste, Italie: une série manganésifère métamorphisée dans le faciès éclogite. Thèse de doctorat, Université Pierre et Marie Curie, Paris, France.
- Perseil, E. A. (1985): Some characteristics of manganese oxide facies in the deposit at St. Marcel-Praborna-Val d'Aosta, Italy. Miner. Deposita 20, 271-276. (in French)
- Preite, D. (1985): La pagina dei Micromounts – Omfacite di Quincinetto e Praborna. Rivista Mineralogica Italiana, 9(2), 88.
- Perseil E. A. & Smith D. C. (1995): Sb-rich titanite in the manganese concentrations at St. Marcel-Praborna, Aosta Valley, Italy: petrography and crystal chemistry. Mineralogical Magazine: 59: 717-734.
- Della Ventura, G., Mottana, A.,Parodi, G.C., Griffin, W.L. (1996): FTIR spectroscopy in the OH-stretching region of monoclinic epidotes from Praborna (St. Marcel, Aosta valley, Italy). Eur. J. Mineral., 8, 655-665.
- Smith, D.C. and Perseil, E.-A. (1997): Sb-rich rutile in the manganese concentrations at St. Marcel-Praborna, Aosta Valley, Italy: petrology and crystal-chemistry. Mineralogical Magazine: 61: 655-669.
- Perseil, E. A. (1998): Evolution cristallochimique des oxydes de manganèse dans le gisement de St. Marcel Praborna (V. Aoste, Italie). Rend. Fis. Acc. Lincei, s. 9, v. 9 (1998) 4, 315-336.
- Perseil, E.-A., Blanc, P. & Ohnenstetter, D. (2000): As-bearing fluorapatite in manganiferous deposits from St. Marcel - Praborna, Val d'Aosta, Italy. Canadian Mineralogist, 38, 101-117.
- Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
- Tumiati, S., Martin, S., Godard, G. (2010): Hydrothermal origin of manganese in the high-pressure ophiolite metasediments of Praborna ore deposit (Aosta Valley, Western Alps). European Journal of Mineralogy 22, 577-594.
- Ciriotti, M.E., Cámara, F., Bittarello, E., Ambrino, P. (2013). Macfallite: secondo ritrovamento italiano a Prabornaz. Micro, 11, 50-59.

External Links

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 25, 2017 01:45:15 Page generated: November 24, 2017 16:22:21
Go to top of page