lettsomiteMin.|ˈlɛtsəmaɪt| [Named by Percy, 1850, after Dr. W. G. Lettsom: see -ite.] A synonym of cyanotrichite (see cyano-). 1850Dana Min. 523 Lettsomite..occurs in spherical globules.1883Encycl.Brit. XVI. 402 Lettsomite..[occurs] in tufts of capillary crystals.