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300 SILICATES. Analyses of black or brown amphibole showing the forms o, c, t m, r Jc,o, i, z, v, and in twin crystals, having a brown streak, and red or reddish-brown by transmitted light, a = 3'17 . 3-24 (basaltic hornblende), t from the Vogelsberg by v. Bons- dorff, u from the WoLfsberg near Czernuzin by Gbschen, t, from Aker by v. Bonsdorff, w from Lmdbo in Westmanland by Ili- smger, x of green or greenish-black amphibole from the Saualp in Carmthia (carmthine) by Clausbruch, y of a black mineral from the Baltym lake, having the form of pyroxene but the cleavage of amphibole (uralite) by Kudematsch Silica .... Alumina . . . Magnesia . . Lime .... Protox. iron . . Protox. mangan. Hydrofluoric acid Water . . . t U V W X y 42'24 40-27 47-21 46-38 46-03 63-03 1392 16-36 13-94 13-82 8-37 4-56 13-74 13-38 21'86 16-34 18'48 12-90 1224 13-80 12-73 13-92 10-23 12-47 14*59 (#» 16-34) 2'28 7‘74 17-44 16-37 0-33 — 0-67 1*50 — — 0-90 — — 0-46 0-44 0-23 — Analyses of amphibole a from Kaltajuva in the Ural hy Henry /3 from Zsidovacz in Hungary, g = 3-136, by Kussin, 7/f°[ n Kimito in Finland hy Moberg, I from Ilaavi on Fillef- jeld by Sukow, e greyish-green from Helsingfors, a = 3*16C, by Pipping, i of tremolite from St. Gotthardt by Damour rt ft y E K 45-18 46 01 43-23 45-37 67-20 58-07 11-34 10-49 11-73 14-81 0-20 17-55 15-09 7-04 14-33 21-20 24-48 9'87 13-80 9-72 14-91 9-45 1299 16-16 10-03 26-81 8-74 11-75 1-82 — 340 1-61 1-60 1-15 — Silica .... Alumina. . . Magnesia . . Lime .... Protoxide of iron Protox. mangan. The amphibole, G = 3-270, from the mixture of augite and amphibole in the basaltic tufa of Hiirtlingen, according to Ram- melsberg, consists of:—silica 42-52, alumina iroo, magnesia 13-45, lime 12-25, protoxide of iron mi, protoxide of man ganese 0'48, soda i'7l, potash i"02, titanic acid roi. In attached and imbedded crystals, columnar, fibrous and granular masses and disseminated. The white, grey, green, semi-transparent or translucent varie ties (grammatite) occur in long implanted crystals and columnar masses m granular limestone or dolomite at Campo Longo on ' Uotthard t, Sebes in Transylvania, Bistrau in Bohemia,