PYEOSMALITE. 229. SCHORLOMITE.—Ferrotitanite; Whitney (Journal of the Boston Nat. Hist. Soc., Jan. 1849, p. 42), Schorlamit; Rammelsherg. Amorphous. Fracture conchoidal. Opaque. Lustre vitre ous. Black, iridescent, ii = 7'5. o = 3'783...3-807. Before the blowpipe melts on the edges with difficulty into a Mack mass. With borax in the outer flame forms a yellow bead which becomes colourless on cooling ; in the inner flame With the addition of tin yields a green bead. With salt of phosphorus on charcoal in the inner flame with tin forms a violet bead. Partially decomposed by hydrochloric acid forming a yellow- solution, which on the addition of ammonia yields a yellow precipitate. silSi + jt 2 Ti, where It is Fe, Ca, Mg. Analyses a, b by Whiti Crossley: — Silica. . . Titanic acid Red ox. iron Frotox. iron Lime. . . Magnesia . a 27'89 20-43 21-90 b 25'08 22-10 21-68 30-06 29-78 by Rammelsberg, e, /by c d e / 27-86 20-09 25-00 20-30 16-32 1730 22-10 21-50 — — 21-68 22-00 23-76 22’83 — 32-01 31-12 29-78 30-72 1-62 1-65 — 1-25 In In analyses a, c the silica contained some titanic acid. a , b the oxide of iron contained a little manganese. Occurs massive with brookito at Magnet Cove, Ilot Springs county, Arkansas. This mineral differs much in external cha racters and in chemical composition from the mineral described by Prof. Shepard as sehorlomite. 230. PYliOSMALITE.—Pyrosmalite ; Phillips, Dufrenoy. Axotomer Perl-Glimmer; Mohs. Pyrosmalith; Hausmann, Haidinger. Ithombohedral. 100,111 = 40° 42'. o ill, a oil, x 120, z 131. FIG. 407. ao 90° o' aa 00 0 xo 31 30 zo 60 47 XX 30 17 z* 45 35 tuni ia ill ii
