nagyagiteMin.|ˈnædʒəgaɪt, ˈnægjəgaɪt| [f.Nagyag in Hungary, its locality; named by Haidinger in 1845.] Black telluride of lead. 1849Nicol Min. 476 Nagyagite..in the open tube emits sulphurous acid.1882Dana Min. (ed. 4) 149 Nagyagite, or Foliated tellurium, is..foliated like graphite.