leidyiteMin.|ˈlaɪdɪaɪt| [Named by G. A. Koenig, 1878, in honour of Dr. Joseph Leidy: see -ite.] A complicated hydrous silicate found in fine yellowish-green scales. 1878in Proc.Acad.Nat.Sci.Philad. 84. 1882 Dana Min.App. 68 Leidyite..consisting of fine scales with silky lustre.