Min., used as combining form of YTTRIUM in names of minerals containing yttrium, the second element usually indicating the other metallic constituent, sometimes an allied mineral: as Yttrocerite [CERIUM], Yttrocolumbite [COLUMBIUM], Yttrogummite [GUMMITE], Yttrotantalite [TANTALUM], Yttrotitanite [TITANIUM]: see quots.
1817. T. Thomson, Syst. Chem. (ed. 5), III. 495. *Yttrocerite … occurs at Finbo in Sweden…. It is found in amorphous masses,… disseminated through quartz.
1868. Watts, Dict. Chem., V. 1065. Yttrocerite. A mineral consisting of fluoride of yttrium mixed with the fluorides of cerium and calcium.
1819. W. Phillips, Elem. Introd. Min. (ed. 2), 202. *Yttrocolumbite…. It consists, according to Vauquelin, of 45 oxide of columbium, 55 of yttria and oxide of iron.
1879. Jrnl. Chem. Soc., XXXVI. 365. *Yttrogummite … is the final product of the decomposition of clevite.
1850. Watts, trans. Gmelin’s Hand-bk. Chem., IV. 19. Samarskite.—This mineral, first named Urano-tantalite or Columbite, and afterwards called *Yttro-ilmenite by Hermann.
1809. Wollaston, in Phil. Trans., XCIX. 246. The two Swedish minerals, tantalite and *yttro-tantalite, from which I could obtain tantalum.
1868. Dana, Min. (ed. 5), 519. Yttrotantalite … Color black, brown, brownish-yellow, straw-yellow…. Tantalate of yttria and lime, or yttria, lime, and iron, with some protoxyd of uranium.
1828. Whewell, Ess. Min. Classif. & Nomencl., 52. Yttro-Tantalum Oxide.
1854. Dana, Syst. Min. (ed. 4), II. 341. Keilhauite,… *Yttrotitanite.
1868. Watts, Dict. Chem., V. 1065. Yttrotitanite. Keilhauite. A silicotitanate containing lime, yttria, ferric oxide, and alumina, with small quantities of other bases.
