Citation: Hawthorne, F. C.; Oberti, R.; Cannillo, E.; Sardone, N.; Zanetti, A.; Grice, J. D.; Ashley, P. M. (1995). A new anhydrous amphibole from the Hoskins mine, Grenfell, New South Wales, Australia: Description and crystal structure of ungarettiite, NaNa2(Mn2Mn3)Si8O22O2 Sample U1. American Mineralogist, 80, pp. 165-172.