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  Naturally occurring asbestos in the Rocks belonging to Sestri – Voltaggio Zone (Liguria, Northern Italy). Excavation Railway tunnels management – Terzo Valico dei Giovi

  The project and construction for the new high speed railway line (connecting Genoa to Milan) faced one of the most important environmental issues: safe excavation and managing of rocks, that may contain asbestos in relevant amounts. Asbestos is a group of fibrous minerals that mainly occurs in mafic and ultramafic rocks (ophiolitic sequences). This work focuses the criteria to better evaluate the amount of asbestos fibers in the metaophiolites belonging to Sestri-Voltaggio Zone (Liguria, Northern Italy). According to Italian law, only six minerals are considered asbestos: chrysotile, actinolite, tremolite, anthophyllite, grunerite, riebeckite. Because of geological reasons, in the Western Alps the only chrysotile, actinlite and riebeckite asbestos may be found naturally.

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