Citation: Ertl, A.; Marschall, H.; Geister, G.; Henry, D.; Schertl, H. P.; Ntaflos, T.; Luvizotto, G.; Nasdala, L.; Tillmanns, E. (2010). Metamorphic ultrahigh-pressure tourmaline: structure, chemistry, and correlations to P-T conditions Locality: Lago di Cignana, Western Alps, Italy. American Mineralogist, 95, pp. 1-10.