Min. The first element of Ytterby see next) used attrib. = combined with yttria, yttriferous, yttrious, in imitation of Sw. or Ger., as in Sw. ytterjord, G. yttererde (ytter earth).
1805. R. Jameson, Syst. Min., II. 585. Yttertantalite…. According to Eckeberg, it is composed of tantalium, the new earth called yttria, and iron.
1877. E. B. Dana’s Text-bk. Min., 281. Yttriferous, or Ytter-garnet.
1897. Ann. Rep. Smithsonian Inst., 239. As early as 1794 Gadolin had separated from the gadolinite of Ytterby an earth which he called ytter earth.
