274 HYDBOUS EAETHS, OXIDES, AND ACIDS. ub 66° 33' cb 90 0 uu 66 64 ea 68 48 ca 90 0 ee 62 30 la 28 34 ma 47 26 da 65 20 ba 90 0 mm? 85 8 dd' 49 20 za 38 18 pa 63° 9' m 75 47 ua 90 0 rb 30 32 pb 60 32 eb 90 0 PP 53 42 pp" 58 56 p'p" 83 47 ss 28 25 ss" 64 43 sd 63 55 ra 74 0 rV" 128° 32' zb 70 1 Zz' 117 44 EIO. 299. 6 Combinations. adp, admp, admpe, admpes, abdmpeur, abdmp- seuz. The faces e smooth; p, s faintly striated parallel to their intersections with each other; p sometimes rather uneven • d, m striated parallel to their intersections with each other ■ the faces a frequently greatly enlarged, giving to the crystals’ the appearance of thin plates. Cleavage, a, very perfect Fracture imperfect conchoidal. Translucent on the edges... opaque. Lustre adamantine. Tellowish-brown, rcddish-hrown ... blackish-brown. In thin plates and fine needles, hyacinth- red by transmitted light. Streak yellowish-brown. Brittle. H = 6'0...6‘6. O = 4'12...4-37. I11 the matrass yields water and turns red. Before the blowpipe in the outer flame becomes brownish-red; in the inner flame becomes black and magnetic. Fusible with very great difficulty. With borax and salt of phosphorus afl’ords the re action of iron. Is easily soluble in hydrochloric acid, frequently leaving a residue of silica. £ell, red oxide of iron 89 - 89, water lo-li. Analyses of crystals (gbthite) from Eiserfeld a by v. Kobell, b by Schnabel, c of crystals from Lostwithiel (a = 4-37) bv I orke, of a fibrous variety from llollerter Zug d by v Kobell e by Brandes, / by Schnabel:— ’ Bed oxide of iron Oxide of manganese Oxide of copper . Water . . Silica . . . a 86'36 0'61 091 11'88 086 b e d e / 89-27 89-66 86-65 88-00 84-24 0-65 0'16 260 060 2’45 — — — — __ 10-08 10-07 11-60 10-75 12*68 — 0-28 0-36 0-60 0*03
