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Frassine, Monterotondo Marittimo, Grosseto Province, Tuscany, Italy

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Sb-Au deposit.
Epithermal mineralization (Carlin type ?), with "invisible gold" (10 micron grains), associated with hydrothermally alteration (argillitic acid and alunitic acid) of host rocks : "Calcare Cavernoso" (Falda Toscana) and Verrucano (Monticiano-Roccastrada unit).
The limestones arepartially dissolved (cavernous), silicified and argillitized.
The fluids at the origin of the mineralization are meteoritic hydrothermal fluids, of low salinity and low pH, in convective regim caused by the heat flux from Larderello geothermal area (intrusive granite pluton / 4 Ma age).
Silica has been leached from deeper rock formations.
Gold and chromium enrichment is due to ophiolitic complex influence.
(Dr. GIOVANNI MONTINI, "Mineralizzazioni epitermali a oro nell'area di Frassine (GR)", Unpublished Paper, Firenze University).

Mineral List

17 entries listed. 14 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.


Braga R., 1977. Il giacimento antimonifero di Frassine. Notiz. Mineral. Paleont. Riccione, 11: 30-37

Tanelli G., Lattanzi P., Ruggieri G., Corsini F., 1991. Metallogeny of gold in Tuscany. Proc. Symp. Gold 91, Brazil: 403-409.

Ruggieri G., 1993. Ore genesis in epithermal enviroment: the examples of Furtei (Sardinia), Frassine and La Campigliola (Southern Tuscany) gold mineralization. Plinius, 9: 134-139.

Montini G., Lattanzi P., Ruggieri G., Maineri C., Tanelli G., 1995. Il sistema epitermale a Sb-Au di Frassine (Grosseto). Plinius, 14: 238-239.

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