A.obsidian, Pliny's obsiana (neut. pl.), HN36.196, cf. Peripl.M.Rubr.5, Orph.L.285, Cyran.26: written “ὀψειανόν” PLeid.X.36B.; [ὀψ]ειανόν dub. in Supp.Epigr.2.776 i 15 (Syria, iii A. D.). (Named from its discoverer Obsius, v. Plin. l. c.; obsidiana is f.l. ibid.; prob. α_ by nature.)