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Forte Stella, Monte Argentario, Grosseto Province, Tuscany, Italy

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 42° North , 11° East (est.)
Margin of Error:~47km
Name(s) in local language(s):Forte Stella, Monte Argentario, Provincia di Grosseto, Toscana, Italia

Outcrops of meta-conglomerates (“anagenites”) and psammo-pelitic rocks typical of the Mid-Triassic Verrucano sequence evidences along the road-cuttings of Via Panoramica, SE of Forte Stella (SSW of Porto Ercole).

Typical metamorphic mineral assemblages of this locality are muscovite-pyrophyllite-paragonite-quartz ± chlorite ± sudoite in Al-rich rich phyllites, locally with chloritoid, and muscovite-quartz ± chlorite ± sudoite ± chloritoid in Al-poorer varieties (Costantini et al., 1995). As in so many other localities of the Monte Argentario Promontory, the high-pressure indicator mineral Fe-Mg-carpholite had escaped everyone’s notice until recent years (Theye et al., 1997; Jolivet et al., 1998). However, in this particular outcrops, ferro- and magnesiocarpholite occur only locally as remains, mostly replaced by breakdown products.

Mineral List

9 valid minerals.

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.


- Costantini A., Decandia F.A., Elter F.M., Franceschelli M., Giorgetti G., Lazzarotto A., Liotta D., Memmi I., Sandrelli F., Tavernelli E. (1995): Low-temperature metamorphism in Southern Tuscany: P-T indicators and geodynamic implications. Workshop on Low-T Metamorphism, Siena, 24-26/5/1995. Guidebook for the Post-Workshop Field Excursion, 1-35.
- Theye T., Reinhardt J., Goffé B., Jolivet L., Brunet C. (1997): Ferro- and magnesiocarpholite from the Monte Argentario (Italy): First evidence for high-pressure metamorphism of the metasedimentary Verrucano sequence, and significance for P-T path reconstruction. European Journal of Mineralogy, 9, 859-873.
- Jolivet L., Faccenna C., Goffè B., Mattei M., Rossetti F., Brunet Ch., Storti F., Funiciello R., Cadet J.P., D’Agostino N., Parra T. (1998): Mid-crustal shear zones in post-orogenic extension: example from the Northern Tyrrhenian sea. J. Geoph. Res., 103, B6, 123-160.
- Reinhardt J., Rossetti F. (2004): Monte Argentario and Isola del Giglio (Southern Tuscany, Italy): a record from continental break-up to subduction, orogenic wedge formation, and post-orogenic extension. 32nd International Geological Congress (IGC), Florence, August 20-28, 2004. Post-Congress P61. Field Trip Guide Book - P61, 19 pp.

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