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GOTIIITE. 273 In the matrass decrepitates violently, and falls into white shining scales, except the variety from Kosoibrod, which does not decrepitate and is brown after ignition, when heated to redness yields water. Before the blowpipe infusible. Borax and salt 'of phosphorus dissolve it, after ignition, easily into a clear colourless glass. It is not acted upon by soda. AAith solution of cobalt becomes blue. Is not acted upon by hydro chloric acid, w-hich dissolves the oxide of iron leaving the mineral colourless. After being strongly ignited is soluble in hydrochloric acid. The Siberian diaspore is soluble in sulphuric acid after ignition. A1H, alumina 85'07, water 14'93. Analyses of diaspore a, b from Siberia by Hess, c from Sweden, d from Siberia, both by Dufrenoy, e from Schemnitz by Lowe:— a b c d e Alumina . . . 85'44 86-61 78-93 74-66 85-13 AVater . . . . 14-66 14-39 15-13 14-68 15-00 Bed oxide of iron . — — 0-62 4-61 — Silica . . . . — — 1-39 2-90 Lime — — 1-98 1-64 — Separate crystals are rare, it usually occurs massive, in slightly curved lamina) which are readily separable; also in masses of slender crystals intersecting each other in every direction. Is found in the Ural at Gomoschit and Kosoibrod with limnite, in narrow veins in chlorite slate ; in crystals and radiating masses with pyrite in veins in porphyry in the Crown Prince Ferdinand mine at Schemnitz in Hungary, in dolomite with corundum on St. Gotthardt, Gumuch-dagh near Ephesus, °ml, as it is said, at Broddbo in Sweden. The angles of corresponding forms in diaspore and gotliite a pproximate to each other, and, though less closely, to those of manganite. 148. GOTIIITE.—Hydrous oxide of iron; Phillips. Eer oxide hydrate; Hauy. Prismatoidisches Habronem-Erz; Mohs. Pyrrhosiderit; Hausmann. Gothit; Haidinger. Prismatic. 011,010=66° 33'; 101,001=31° 15'; 110,100=47° 26'. « 100, I 010, ti oil, e 101, d 120, m no, I 210, s 122, P ill, * 622, r 131. r truncates the edgeph.