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240 OXIDES, EAETIIS, AND ACIDS. feet; r, indistinet. Fracture conclioidal. Opaque. Lustre metallic, imperfect. Iron-black, sometimes passing into steel- grey. Streak black, in the variety from Spessart and St. Gotthardt brown. Brittle, h = 5'0...6'0. g = 4-66...6-31. More or less magnetic. Infusible before the blowpipe. With salt of phosphorus in the inner flame forms a red glass. Imparts a blue colour to hot concentrated sulphuric acid without dissolving. In fine powder soluble in concentrated hydrochloric acid. When the solution is concentrated as much as possible without being decomposed, it yields a precipitate of titanic acid on being largely diluted with water and boiled for a considerable time. Analyses of ilmenite a from Gastein, g = 4-665...4735, by v. Kobell, b from St. Christophe near Bourg d’Oisans, G = 4727 (crichtonite), by Marignac, c from the Ilmen moun tains, G = 4 - 76...4-81 (ilmenite), by Mosander, d from Eger- sund, G = 4-751, by H. Bose; e from Washington, g = 4-003... 5-oie (washingtonite), by Marignac, / from Spessart, g = 6-06 ...5'13, by v. Kobell, g from the Binnenthal in Wallis, G= 5-127, by Kammelsberg Titanic acid Bed oxide of iron Protoxide of iron Protox. mangan. Magnesia . . Analyses of ilmenite from the Ilmen mountains h by Mo sander, i by Delesse, k from Egersund by v. Kobell, I from Connecticut by Kendall, m from Udewalla by Plan tumour, n from St. Gotthardt by v. Kobell:— a I e d e / 69-00 62-27 46-02 43-73 22-21 14-16 4-25 1-20 10-74 42-70 69-07 75 00 36-00 46 53 37-86 13-57 18-72 lO'Oi 1-66 — 2-73 — 0'80 — — 1-14 — h i k I m n Titanic acid 46-67 45-4 43 24 25-28 16-66 12-07 Bed oxide of iron 11-71 40-7 28-66 61-84 71-26 82-49 Protoxide of iron 3537 14-1 27-21 22-86 1132 4’84 Protox. mangan. 2-39 — — — Lime «... 0-26 0-5 — Magnesia . . 060 — — • — — Oxide of chrome 0-38 Sn 0*5 — Silica.... 2-80 Pb 0'2 FI, Si, loss 1-87 — Analyses of ilmenite 0, sund, all by Mosander:— 0 p, q from Arendal, r, s, t from Esrer- P 1 r 8 t Titanic acid . . 20-41 24-19 23-69 39-04 42-67 41-08 Bed oxide of iron 65-23 63 01 68-61 29-16 23-21 26-93
