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486 AESEHIATES, PHOSPHATES. FIG. 487. PIG. 488. ■r" a" PIG. 489. Combinations, oa, oai, ax, abx, airr / , oarr , fig. 490. oai, oaxrr t , oalizrr t , oxizeerrss t , odbixrrft', oabxzee / rr / h'u'u\, oabxziee i rr l u'u]ft', oaxzee t r- r t u'u y 'h'l/, oabxiee / rr l u'u / 'd'd\ Cleavage, o, a, both imperfect, a more easily obtained than o. Fracture eonchoidal, more or less perfect, un even. Transparent...translucent. Lustre vi treous, inclining to resinous. Colourless, white, grey, blue, green, yellow, red, brown. Dichro matic. Streak white. Brittle, h = 6 - o. g = 3-18...3-21. In very thin splinters is fusible with difficulty before the blowpipe into a colourless transparent glass. With borax is dissolved slowly into a clear glass, which may bo rendered opaque by an intermitting flame. Soluble in salt of phos phorus, forming a clear bead, which, when saturated with the assay, becomes opaque on cooling, and shows crystalline facets. Soluble with difficulty in boracic acid; with iron wire yields a phosphide of iron. Moistened with sulphuric acid it imparts a green colour to the flame. With salt of phosphorus and oxide of copper yields the reaction of chlorine. With salt of phosphorus in the open tube, or with sulphuric acid, gives indi cations of fluorine. Soluble without effervescence in hydro chloric acid, and in nitric acid. The solution in nitric acid of the varieties containing chlorine gives a precipitate with nitrate ot silver. Some varieties phosphoresce when heated; others when rubbed.