Lagalyite, mimetite, piromorfi te, vanadinite di Capo Pero, Rio Marina, Livorno – Minerali e geologia della punta orientale dell’Isola d’Elba

Thanks to the discovery carried out by one of the authors (CB) and to the SEM-EDS, micro-Raman, XRD studies and investigations, the article describes and documents for the first time the historical events, the geology and the representative mineralogy of Capo Pero, Cavo, Elba Island, Livorno, Tuscany. In the Capo Pero area, the outcropping rocks are represented by marbles with quartzite levels, calcschists, phyllites, metasandstones and metarenites belonging to the Mesozoic-Cenozoic successions of the Tuscan Dominion (Adriatic margin of the Apennines) and which did not record the effect of contact metamorphism due to their distance from the Porto Azzurro pluton. On the contrary, they underwent a low-grade metamorphic process, during the Oligocene, linked to the collisional evolution of the chain. The study of fluid inclusions, conducted in some quartz crystals associated with hematite mineralization, allow to trace the geochemical characteristics of the hydrothermal fluid and its temperature. Minerals were found in dismantled blocks from the cliffs and, in the sampling, no heaps or mineral material of the adjacent Rio Albano complex randomly present in the area were examined, but only the mineral phases found in outcrop. The identified minerals consist of "adularia", calcite, cerussite, clinochlore, hematite, galena, lagalyite (first occurrence for Italy) pyrite, quartz, the complete isostructural series of the apatite group (with a lot of different morphologies and colors): mimetite, pyromorphite, vanadinite and an interesting intermediate Cr-rich term mimetite – pyromorphite – (vanadinite).