ttrium

[Latinized from Ytterby, a town in Chemistry: A dyad earth-metal, symbol Y, atomic weight 61.7, existing, together with erbium, as a silicate in gadolinite. It is obtained in the metallic state by digesting the mineral with hydrochloric acid, precipitating with oxalic acid, di olving the oxalates formed in nitric acid, and separating by a series of fractional crystallizations; the erbium salt, being the le soluble of the two, crystallizing out first. On converting the nitrate into a chloride, and igniting with pota ium, the metal is obtained as a blackish-gray powder, consisting of small, metallic, lustrous scales. It unites directly, at high temperatures, with chlorine, oxygen and sulphur, and probably with other metalloids. yttrium-carbonate, s. [TENGERITE.] yttrium-garnet, s. Min .: A variety of garnet occurring in Norway, containing, according to Bergemann, sometimes as much as 6'66 per cent. of yttria. yttrium-oxide, s. Chem.: YO. Yttria. A soft white powder, obtained by igniting the oxalate. When boiled in hydrochloric, nitric, or sulphuric acids, it di olves slowly but completely, forming colorle salts, and, when ignited, it glows with a pure white light. yttrium-phosphate, s . [XΕΝΟΤΙΜΕ.] t-tro-, pref. [YTTRIUM.] Containing or resembling yttrium (q. v.). cite.] IMG:content-1108.png:[blocks in formation] Min.: The same as YTTROTANTALITE (q. v.). ŷt-tro-gum-mite, s . [Pref. yttro- , and English Min.: A mineral found a ociated with cleveite (of which it is probably a decomposition product), near Arendal, Norway. Hardne , 5.0; luster, brill descending arithmetical progre ions of 4, 3, 2.1, according to the notions of diminishing virtue in the several ages applied to a cycle of 12,000 divine years, each equal to 360 years of mortals; and 12,000 × 360 is=4,320,000, the periods of the four yugas added together. ( Mill : Hist . of Brit . India (ed. 4th), i. 155-157.) yu-lan, s. [Chinese (?).] Bot.: Magnolia conspicua (= M . yulan ), a tree, a native of China, where it is forty or fifty feet high, though in Europe and America but twenty or twenty-five. It has large, brilliant snow-white flow early in spring before the leaves appear. ure, conchoidal. Composition: A hydrated oxide of yttrium and uranium. yt-tro-il-men-ite, s. [Pref. yttro-, and English ilmenite.] Mineralogy: 1. A variety of yttrotantalite in which Hermann supposed he had found a new element, his ilmen ium. 2. The same as SAMARSKITE (q. v.). Št-tro-tăn-ta-līte, s. [Pref. yttro-, and English tantalite.] Mineral.: An orthorhombic mineral occurring, in crystals and ma ive, in felspar and quartz, at Ytterby and Fahlun, Sweden. Hardne , 5-5.5; specific gravity, 5-4-5-9; luster, vitreous to greasy; color, black, brown, shades of yellow; opaque to sub translucent; fracture, conchoidal. Composition: A tantalate of yttria and lime, with sometimes iron and protoxide of uranium, a mean of several analyses yielding tantalic acid, 62-5; yttria, 22-6; lime, 5.2; protoxide of iron, 34; protoxide of uranium, 6.3=100, which corresponds to the formula 10(YO, FeO, CaO, UO)3TaO5.