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3G2 SILICATES. Analyses a by Fuchs, 6 by v. Kobell, c by Schafhiiutl:— a b c Silica . . . . . 49-30 50-29 49-20 Alumina . . . . 2790 27-37 27'30 Lime . . . . . 14-42 13'53 16-48 Soda . . . . . 6-46 5-92 4-53 Potash . . . 0'17 1-23 Water . . . . . 0-90 1-20 Chlorine . . . . — 0-92 In crystals and granular masses. The crystals are found imbedded in isolated blocks of felspar in the porcelain earth-pits at Obemzell near Passau, the massive varieties in a bed in granite near the same place. Is decomposed by exposure, and transformed into friable porcelain earth, which frequently retains the form of the crystals. 205. SPODTTMENE.—Spodumene ; Phillips. Triphane ; Hauy. Prismatischer Triphan-Spath; Mohs. Triphan; Ilaus- mann. Spodumen; Haidinger. Oblique . 101,100 = 49° 50'; 111,010 = 45° 33' a loo, b 010, C 001, t oil, m no, 112, 0 212 ib 39° 45.' xb 58° 0' cb 90 0 xc 45 9 ib 17 33 VC 69 32 mb 43 30 me 103 67 ab 90 0 ta 102 66 ca no 30 va 62 35 vb 45 33 xa 78 48 ob 63 63 oa 64 36 i 130, v 111, fig. 378. Cleavage, a, perfect; m, not quite so perfect. Fracture uneven...splintery. Translucent...translucent on the edges. Lustre vitreous, inclining to pearly on the cleavage planes. Greenish-white...apple-green...light greenish - grey. Streak White. H = 6-5... 7'0. G = 3'07...3'20. Intumesces before the blowpipe, imparts a fleeting redness to the flame, and fuses easily into a transparent glass. With solution of cobalt becomes blue. Melted with fluor and bisul phate of potash it colours the flame red. Is dissolved in salt of
