yttro- Min.,
(ˌɪtrəʊ)
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 (-ˈsɪəraɪt) [cerium], yttrocoˈlumbite [columbium], yttroˈgummite [gummite], yttroˈtantalite [tantalum], yttroˈtitanite [titanium]: see quots. yttroˈtungstite, a basic oxide of yttrium and tungsten, YW2O6(OH)3, occurring as yellow monoclinic crystals.
| 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 *Yttro⁓columbite... 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 tr. Gmelin's Handbk. 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. |
| 1950 E. H. Beard in Colonial Geol. & Mineral Resources I. 51 The results show conclusively that the term ‘thorotungstite’ is inapplicable as a true description of the mineral... It is suggested that the mineral in future be called yttrotungstite. 1971 Mineral. Mag. XXXVIII. 262 All the specimens studied consisted mainly of a fine-grained aggregate of pale-yellow earthy yttrotungstite, with rare druses lined by yttrotungstite crystals. |