| 单词 | churchite- |
| 释义 | > as lemmaschurchite-(Y) A rare mineral consisting of a hydrated phosphate of rare earth elements (chiefly yttrium; originally thought to be chiefly cerium), typically occurring as white needle-like crystals. In recent use also with following chemical symbol, as churchite-(Y).Chemical formula: YPO4·2H2O. Crystal system: monoclinic. ΘΚΠ the world > the earth > minerals > types of mineral > phosphates > [noun] > rare earth phosphates turnerite1823 monazite1836 xenotime1844 cryptolite1846 churchite1865 urdite1868 rhabdophane1878 scovillite1883 rhabdophanite1892 florencite1899 1865 C. G. Williams in Chem. News 20 Oct. 183/1 This made me desirous of ascertaining whether the new and highly interesting mineral described by Professor Church in the Chemical News for September 15, 1865 (and for which I venture to propose the name of churchite), contained cerium only. 1921 E. S. Larsen Microsc. Determination Nonopaque Minerals 4 Optical orientation of tabular crystals of churchite. 1955 Mineral. Mag. 30 211 As will be shown below, churchite actually contains very little cerium, and is essentially a phosphate of yttrium with minor amounts of other rare-earths. 1994 Acta Crystallographica C. 50 1651/1 The gypsum-type structure of the title compound, weinschenkite [churchite-(Y)], is confirmed. < as lemmas |
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