Min. [Named by Percy, 1850, after Dr. W. G. Lettsom: see -ITE.] A synonym of Cyanotrichite (see CYANO-).
1850. Dana, Min., 523. Lettsomite … occurs in spherical globules.
1883. Encycl. Brit., XVI. 402. Lettsomite … [occurs] in tufts of capillary crystals.
