Min. [f. the name of S. T. Tyson, from whom it was received + -ITE1.] A rare native fluoride of the cerium metals.
1880. Allen & Comstock, in Amer. Jrnl. Sc. & Arts, XIX. 390. The formula (Ce, La, Di)2Fl4 appears … to express the composition of the mineral…. It should be regarded as a new species. We propose for it the name Tysonite.
