单词 | cryolite |
释义 | cryoliten. Mineralogy. A mineral consisting of a fluoride of aluminium and sodium which occurs typically as white or colourless massive deposits and is used in electrolytic aluminium smelting as a flux to dissolve bauxite.Chemical formula: Na3AlF6. Crystal system: monoclinic. ΘΚΠ the world > the earth > minerals > types of mineral > halides > [noun] > other fluorides cryolite1800 yttrocerite1817 fluocerite1835 prosopite1854 pachnolite1866 thomsenolite1868 tysonite1880 hieratite1882 villiaumite1908 neighborite1961 1800 Philos. Mag. 7 259 It fuses by the flame of a taper, and flows like glass [read ice: Fr. glace] by the blow-pipe: for this reason it has been called at Copenhagen cryolite. 1877 R. W. Raymond Statistics Mines & Mining 427 Kryolite from spathic iron. 1888 Times 19 Nov. 10/3 The cryolite mines at Ivigtut. 1928 Pop. Sci. Monthly Feb. 36 Hall found that melted cryolite readily dissolves powdered bauxite. 1968 Ceramic Processing (National Res. Council (U.S.) Comm. Ceramic Processing) 98 Growth of reasonably large sapphire and ruby single crystals has been accomplished from a cryolite (i.e. Na3AlF6) solvent. 2007 Independent (Nexis) 17 Sept. 32 When the Second World War came the US moved into Greenland to mine cryolite. This entry has been updated (OED Third Edition, June 2011; most recently modified version published online March 2022). < n.1800 |
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