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608 FLUORIDES, CHLORIDES, BROMIDES, IODIDES. 438. FLTTOCERITE.—Neutral fluate of cerium; Phillips. Elueerine; Beudant. Neutrales Flusssaures Cerer; Mohs. Fluocerit; Hausmann, Haidinger. Bhombohedral. o ill, a on. EIG. 614. ao ad 90“ 60 Fracture uneven, splintery. Opaque, translucent on the edges. Lustre feeble. Pale red, yellowish. Streak yellowish- white. h = 4*0...5*0. G = 4*7. In the matrass yields hydrofluoric acid and some water, and becomes white. In the open tube becomes dark yellow, and the hydrofluoric acid evolved corrodes the glass. Infusible before the blowpipe. In salt of phosphorus dissolves com pletely into a glass which is red while hot, but colourless and transparent when cold. CeF + Ce’F 3 . From loo parts of fluocerite Berzelius obtained:— Oxide of cerium .... 82*64 Yttria 1*12 Is found in imbedded crystals and massive, at Broddbo near Fahlun, in albite and sometimes in quartz, with yttrocerite, mica, garnet and yttrotantalite. 439. YTTROCERITE. — Yttrocerite; Phillips, Beudant. Pyramidaler Cerer-Baryt ; Mohs. Yttrocerit; Hausmann, Haidinger. Fracture uneven... conchoidal. Translucent... opaque. Lustre vitreous, inclining to waxy, feeble. Dark violet-blue, purple, greyish-red, grey, white. Streak white. Brittle. h = 4*0...4*6. G = 3*447. Before the blowpipe becomes white, or reddish-white, but does not fuse. With borax and salt of phosphorus melts into a clear glass. In fine powder is easily and completely soluble in boiling hydrochloric acid, forming a yellow solution. Is decomposed by sulphuric acid with evolution of hydrofluoric acid. CaF, YF, CeF. According to the analyses of Gahn and Berzelius, ioo parts of yttrocerite from Finbo yielded:— Oxide of cerium .... 18*22 16*45