Tourmalines from San Piero in Campo and other minor occurrences from the Elba Island - Le tormaline di San Piero in Campo e le altre giaciture minori dell'Isola d'Elba

Field trip to a well exposed LCT gem-pegmatite dyke swarm that developed at the contact between the slightly peraluminous Monte Capanne monzogranite pluton and its contact aureole. It is one of the youngest LCT gem-pegmatite complexes in the planet (6.9 Ma). Thanks to the very young age, the petrologic study of these rocks avoided the usual problems encountered in old systems (difficulties in the application of radiogenic isotope systematics to to error propagation with age; tectonic-metamorphic-hydrothermal reworking, etc.). For these reasons, the petrologic comparison of pegmatites with the potential monzogrante and leucogranite parets was possible, providing us with important insights on the behavior of these systems. Additionally, the overall small size of these pegmatite dikes allows for the study of structure, texture, mineralogy and geochemistry at a more manageable scale than in most large LGT pegmatites. The large number of pegmatitic dykes showing different degrees of geochemical evolution and the various types of host rocks allowed the development of variable compositions in tourmaline crystals, resulting in the occurrence of a quite large number of species.