378 SILICATES. Silica .... Alumina . . . Red oxide of iron Lime .... Magnesia . . Soda .... Potash . . lixture of augite, by Forchammer, f from iorsa in Iceland (0 = 00 00 CO by G-enth:— a b c d e / 44'49 44-12 43-79 46-0 47-03 48-75 34-46 35-12 35-49 37-0 32-52 30-59 0-74 0-70 0-57 — 2-01 1-50 15-68 19-02 18-93 14-5 17-05 17-22 5-26 0-50 0-34 — 1-30 0-97 0-27 0-08 0-0 1-09 1-13 0-25 0-54 — 0-29 0-02 in ^ crystals and massive, with other volcanic minerals, near Ve S nv' S ™\ tered of dolomite 011 Monte Somma in th Jmp+Io ’ “f 7 f?;, 111 Icelaud > at Paras in Columbia, m the meteoric stones that fell at Juvenas. crv7tX ng t' USe( i th6 i. te i rnl 1 . tail0rthie ’ t0 denote the astern of rystalhzatwn to which the crystals of this substance belong, and, as the name anorthite’ might with equal propriety have been applied to eveiy other member of the system, we have tain ^ f C f f adopt the name of ‘ christianite,’ assigned to cer- cr y st als of it by M. Monticelli, to designate this mineral. + CATROBITE. Latrobite ; Phillips, Beudant. La- trobit; Mohs, Hausmann, Haidinger. Anorthic. Cleavage in three directions, making with each other angles of 86 30 ,78 15 and 71° o'. Fracture uneven. Translucent, lustre vitreous, inclining to pearly. Pale red. n = s-o 0-0. G = 2’720...2’722. Becomes white before the blowpipe, and melts with intu mescence on the edges. With borax fuses into a clear glass. Analyses by C. Gmelin ;—- Lime Oxide of manganese . Magnesia .... 44-05 41-78 30-81 32-83 8-28 9-79 0-68 0-68 3-10 1 0-03 J 6-77 2-04 2-04 In imperfect crystals; massive; disseminated. Amitnt 7 th fels P ar > mica and calcite on the island of Bolton in^Iassachusetts^ 14 is 8aid to occur als0 at
