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Signols Quarries, Signols, Oulx, Susa Valley, Torino Province, Piedmont, Italy

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 45° North , 6° East (est.)
Margin of Error:~10km
Other regions containing this locality:The Alps, Europe
Köppen climate type:Dfc : Subarctic climate
Name(s) in local language(s):Cave di Signols, Signols, Oulx, Val di Susa, Torino, Piemonte, Italia

Ancient anhydrite and gypsum quarries.
Three quarries are situated in a Triassic complex, here named Signols Quarries, in which anhydrite and gypsum were extracted from 1883 to the first years of the 1960s:
- Cumbë Suřdë quarry (the unique with underground works and with dump);
- ‘l Rapilhun quarry (open pit without dump);
- La Cařieřa quarry (open pit without dump).

The only quarry in which the paragenesis with the "red hydrated sulfosalts" occurs is the Cumbë Suřdë quarry.
The mica occurring at the Cumbë Suřdë quarry is Li-rich.

The minerals of this evaporitic formation have been studied by:
- Colomba (1898, 1909): anhydrite, gypsum, dolomite, hematite, halite, "lithio-magnesiferous mica", pyrite, quartz, sphalerite, sulphur, "tourmaline";
- Barresi (1999), Barresi et al. (2005): fluorite, orpiment, "realgar", stibnite;
- Biagioni et al. (2010, 2011): ambrinoite, enargite, galkhaite;
- Orlandi (2011): “guettardite/twinnite”, kesterite, orickite, zinkenite;
- Brizio et al. (2014): calcite, celestine, getchellite, guettardite (confirmed), mimetite, sellaite, uraninite, and wulfenite.
The red mineral previously identified as "realgar" is the new species ambrinoite (Biagioni et al., 2011).

Albite, anatase, brookite, “chlorite”, hematite, pyrite, quartz, rutile, and "synchysite"(?) from Signols were found in an outcrop not so far away, but not in the quarries themselves and never in the dump of the Cumbë Suřdë quarry.

Mineral List

35 valid minerals. 1 (TL) - type locality of valid minerals. 1 erroneous literature entry.

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Colomba, L. (1898) Ricerche mineralogiche sui giacimenti di anidrite e di gesso dei dintorni di Oulx (Alta Valle della Dora Riparia). Atti della Regia Accademia delle Scienze di Torino, 33, 779-796.
Colomba, L. (1909) Osservazioni mineralogiche e litologiche sull’alta valle della Dora Riparia (rocce e minerali della Beaume, Oulx). Rivista di Mineralogia e Cristallografia Italiana, 38, 50 pp.
Barresi, A. (1999) La Val di Susa e i suoi minerali. Volume 2. Gruppo Mineralogico e Paleontologico CAI-UGET, Torino, 32 pp.
Barresi, A., Brizio, P., and Ambrino, P. (2005) I giacimenti di gesso triassici della Val di Susa e i loro minerali. Nuove segnalazioni mineralogiche dai giacimenti di gesso triassici piemontesi. In: Damarco, P., Barresi, A., eds. (2005): I giacimenti gessiferi in Piemonte. Mineralogia e Paleontologia. II Edizione. CAI-UGET, Torino, 17-26.
Piccoli, G.C., Maletto, G., Bosio, P., and Lombardo, B. (2007) Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo), 607 pp.
Biagioni, C., Ciriotti, M.E., Ambrino, P., and Brizio, P. (2010) Secondo ritrovamento europeo di galkhaite: Cumbë Suřdë, Signols, Piemonte. Micro (UK report), 1/2010, 118-123.
Biagioni, C., Bonaccorsi, E., Pasero, M., Moëlo, Y., Ciriotti, M.E., Bersani, D., Callegari, A.M., and Boiocchi, M. (2011) Ambrinoite, (K,NH4)2(As,Sb)8S13•H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: the first natural (K,NH4)-hydrated sulfosalt. American Mineralogist, 96, 878-887.
Orlandi, P. (2011) Zibaldone di mineralogia italiana 2010. Micro 1/2011, 39-42.
Brizio, P., Bittarello, E., Ambrino, P., and Ciriotti, M.E. (2014) Cava di Cumbë Suřdë, Signols, Oulx, Val di Susa, Torino, Piemonte. GMT 2014 Giornate Mineralogiche di Tavagnasco, 6-8 giugno 2014. Plinius, 40, 178.

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