382 SILICATES. Analysis by Scacchi:— Silica 42'11 Alumina 24*50 Lime 32-43 Soda 2*93 Is found among tbe anciently ejected debris of Vesuvius. 219. SCAPOLITE.—Scapolite ; Phillips. Meionite, Wer- nerite, Paranthine; Hauy. Pyramidaler Elain-Spath. Mohs. Wernerit; Hausmann, Haidinger. Pyramidal. 101,001 = 23° 45'-5. c 001, a 100, e 101, m 110, f 310, r ill, z 311, w 331. The form z is sometimes hemihedral with asymmetric faces, the alternate faces z being wanting. ac 90° 0' aaf 90 0 ma 45 0 fa 18 26 fm 26 34 e’e' 47 31 ee' 33 7 re 31 54 rm 58 6 FIG. 397. r’r" 63° 48' rr' 43 53 WC 61 50 Wt 28° 10' em 73 27 za 39 37 FIG. 398. (V Combinations, rma, crma, erma, rwzma, rzmaf. Cleavage. «, perfect; m, imperfect; c, traces. Eracture conchoidal. iranslucent...opaque. Lustre vitreous; on surfaces of frac ture resinous; a, m pearly. Colourless, white, grey, green, red in ^impure varieties. Streak white...greyish-white. Brittle. II — 5*0...5-5. $ — 2*01...2*78.
