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 MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Crodo, Antigorio Valley, Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy

This page is currently not sponsored. Click here to sponsor this page.
Name(s) in local language(s): Crodo, Valle Antigorio, Val d'Ossola, Provincia del Verbano-Cusio-Ossola, Piemonte, Italia
Large portions of the municipal territory of Crodo are made of orthogneisses, paragneisses, and amphibolites of the Antigorio nappe. However, the main geological feature of its territory, located to the north, is the “Verampio-Baceno window”, where crops out the Verampio metagranite (leucogranitic gneiss), the lowermost unit of the Lepontine dome exposed in the Toce domain of the Penninic realm. This metagranite is overlain by 200 meters of garnet schists, the Permo-Carboniferous Crodo-Baceno schists, and Mesozoic sediments of the Teggiolo Zone.

Gold-bearing ores are known at various sites near Crodo.
The main occurrences, situated NW of Crodo on the right of Rio Alfenza, are divided into Alfenza dykes (Alfenza mine), embedded in the Crodo-Baceno garnet micaschists, and Faella dyke, embedded in the Antigorio gneiss. The ore mineralogy of the Faella dyke is quite simple and includes quartz, pyrite, chalcopyrite, pyrrhotite, hematite, and native gold. The Alfenza dykes, four parallel dykes (up 50 cm in thickness), included in NNW-SSE oriented fractures, and a smaller one, intersecting the first two dykes, show a richer paragenesis, which includes quartz, calcite, dolomite, siderite, pyrite, arsenopyrite, chalcopyrite, bornite, native gold, galena, sphalerite, bismuthinite, cosalite, molybdenite, etc.
Minor dykes are known W of Crodo (area Viceno-Mozzio) at Rondola, Emo, and Valle d'Oro (Rio d'Oro). Other Au-bearing mineralisations have been reported NE of Crodo, on the left side of Antigorio Valley, at Balmetta, Maglioggio, and Cruppo (Jervis, 1873; Pipino, 2003). At Maglioggio traces of cosalite in association with pyrite have been also observed (Mattioli, 1979).

At Crodo an interesting mineralogical museum, inaugurated on 2 July 2006, was created by the Mineralogical Section of Centro Studio Piero Ginocchi in cooperation with the Veglia-Devero Natural Park Authority, private mineral collectors-rockhounds and their organisations. The Mineralogical Museum named after Aldo Roggiani and Angelo Bianchi, located in same building as the National Museum of Mineral Waters at the entrance of the Crodo Thermal Springs Park, offers visitors an overview of the mineralogical wealth of the Ossola territory. Special emphasis is placed on minerals from the Veglia-Devero Natural Park and Mount Cervandone area in particular. From this last locality, in addition to the type specimen of paraniite-(Y), representative exhibits of anatase, asbecasite, beryl, cafarsite, cervandonite-(Ce), diopside, fluorite, gasparite-(Ce), hematite, quartz, rutile, synchysite-(Ce), tilasite, and xenotime-(Y) are displayed. Worthy of particular mention are also some historical specimens from the Simplon Rail Tunnel and the gold mines of Alfenza (Crodo, Antigorio Valley) and Lavanchetto (Ceppo Morelli, Anzasca Valley).

Mineral List

Mineral list contains entries from the region specified including sub-localities

79 entries listed. 53 valid minerals.

Localities in this Region


The above list 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.


- Jervis G. (1873): I tesori sotterranei dell'Italia. Vol. 1: Regioni delle Alpi. Ed. Loescher, Torino, 410 pp.
- Mattioli V. (1979): Minerali Ossolani. Ed. Arti Grafiche Medesi, Milano, 268 pp.
- Pipino G. (2003): Oro, Miniere, Storia. Miscellanea di giacimentologia e storia mineraria italiana. Ed. Museo Storico dell'Oro Italiano, Ovada, 510 pp.
- Piccoli G.C., Maletto G., Bosio P., Lombardo B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" di Alba, Ed., Alba, 607 pp.

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 1993-2015, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 9, 2015 13:21:27 Page generated: July 29, 2015 17:44:58