Volltext Seite (XML)
SILICATES. !: In analysis a, the presence of soda in the mixture of lithia and soda was overlooked. Is found in granular and compact masses in the island of Tito, at Bolton and Littleton in Massachusetts, near York on the north coast of lake Ontario, in attached crystals (castor) in granite in Elba. 207. POLLUX.—Pollux; Breithaupt, Hausmann. Traces of cleavage. Fracture conchoidal. Transparent. Lustre vitreous, bright. Colourless, white. n = 6'0...6'6. a = 2‘868... 2’892. Before the blowpipe becomes opaque. In thin splinters melts on the edges into a blebby enamel. Imparts a reddish- yellow colour to the outer flame. Easily soluble in borax forming a clear glass. Analysis of a very small quantity by Plattner:— Silica 46'20 Alumina . 16-39 Bed oxide of iron o-86 Potash 16-61 Soda with a trace of lithia .... 10'-17 Water 232 Is found with petalite in the drusy cavities of granite in Elba. 208. FELSPAB.—Felspar; Phillips. Feldspath (in part) ; Hauy. Orthotomer Feldspath; Mohs. Feldspath; llaus- mann. Adular; Haidinger. X oh * Oblique. 101,100 = 65°47'; 111,010 = 63° 7'; 101,001 = 60° 20'. * f. a 100, b 010, C 001, y 201 , r 403, X 101, q 203, w 201, U 221, m 110, z 130, V 241, g 112, h d 023. 241, , » e 021, 111. i 061, 0 ill, S 131, I cb 90° o' nb 45° 3' eb 72 ( 3 20' ab , 90 0 hb 71 36 db 49 10 cd 63 53 zb 29 25 zc 102 29 » ca 116 7 mb 59 24 xm 69 20 ye 80 22 xb 90 0 xz 78 23 re 63 27 ob 63 7 y* 66 31 xc 50 19 sb 33 20 ay 39 27 qc 34 13 ub 67 0 ny 83 12 we ib 41 0 vb 37 35 dy 113 12 18 28 9b 74 28 ym’ 134 19