guitermaniteMin.|gɪˈtɜːmənaɪt| [Named by Hillebrand, 1885, after Guiterman, its discoverer: see -ite.] Sulph-arsenide of lead of a bluish-grey colour, and metallic lustre. 1885Geol.Surv.U.S. Bulletin xx. 105 The mineral appears to be new to science, and a name, Guitermanite, is proposed.