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22G OXIDES, EAETIIS, AND ACIDS. powder soluble with difficulty in hot concentrated sulphuric acid. The specific gravity is not altered by ignition. Ti, titanium 60’13, oxygen 39'87. Analyses of rutile a from St. Trieux by H. Bose, b from St. Yrieux by Damour, c from Freiberg by Kersten:— a b c Titanic acid ... . 98-5 97'60 90-75 Bed oxide of iron . . 1-5 1-55 2-40 Ekeberg found chrome in rutile fromKaring-Bricka in Sweden. In imbedded and attached crystals and massive, in veins in early rocks with quartz, felspar, mica, tourmaline, or in beds of magnetic iron ore with malacolite and garnet, also disseminated in rocks. Imbedded in quartz at llosenau in Hungary, on the Bacher in Stiria, at Snarum and JVIodum in Norway. In implanted crystals in the Saualp and near "YVindisch-Kappel in Karinthia, Schollkrippen near Aschaffenburg, Teinach in Stiria, Pfitsch and Lisenz in the Tyrol, Salzburg, near Freiberg. Massive at Gangehanscl near Petschau in Bohemia. In beds of iron ore at Arendal in Norway. Acicular crystals enclosed in quartz and net-like aggregations occur principally in Switzer land and Savoy. In pebbles and crystals in alluvium near Jungwoschitz and Malonitz in Bohemia, in the gold washings of Ohlapian in Transylvania, Ceylon, at St. Yrieux in France, Horcajuelo near Vuitrago in the province of Burgos in Spain. In Sweden, Siberia, South and North America. In Scotland at Cairngorm, in quartz and calcite at Craig Cailleach near Killin, in quartz in Ben-gloe. In gneiss in the Isle of Burray, Shet land ; in quartz in Fife and Crianlarich in Perthshire. Crystals of rutile are frequently attached to the hematite of St. Gotthardt in such a manner that the faces a, e are very nearly parallel respectively to the faces 0, r of the hematite. The Mineralogical Museum at Cambridge contains several twins, in which the axes of the individuals make with each other an angle of 54° 44'. These were described in the ‘ Philo sophical Magazine’ for October, 1840. 116. BEOOKITE.—Brookite; Phillips, Beudant. Brookit; Mohs, Hausmann, Ilaidinger. ’ Prismatic. Oli,oio=4l°42'-3; 101,001 =43° 2l'-7; iio,ioo=49°65'. a 100, b 010, e 001, x 012, y 014, d 403, t 201, m 110, I 120, k 140, p 2 11 0, g 4 23 0, 0 111, n 211, to 722, » fill, e 212, 8 232, r 221, U 874, i 432, Z 112, V 230, / 10 3 2, 0 14 6 18.
