Lipari obsidian is of excellent quality, black sopra colour, very shiny and sometimes perlitic It is generally subaphyric and contains clinopyroxene micro-phenocrysts (10–50 m), almost always mediante synneusis with magnetite and olivine micro-phenocrysts (Acquafredda et al., 1999). 3.2. Sardinia: Montagna Arci 30 km 2 and located per the periferia of the gulf of Oristano. The […]