Citation: Siidra, O. I.; Vergasova, L. P.; Krivovichev, S. V.; Kretser, Y. L.; Zaitsev, A. N.; Filatov, S. K. (2014). Unique thallium mineralization in the fumaroles of Tolbachik volcano, Kamchatka Peninsula, Russia. I. Markhininite, TlBi(SO4)2. Mineralogical Magazine, 78, pp. 1687-1698.