TIG. 202. OXIDES, EARTHS, AND ACIDS 90 0 67 30 50 21 78 18 106 17 116 0 Fracture con- choidal. Opaque. Lustre metallic. Iron-black. Brittle. Scratches glass very easily. Not magnetic. In twin crystals (twin-face o) on quartz coloured by chlorite. Is supposed to have been found in Dauphine. i l l ill 125. COEUNDUM.— Corundum; Phillips. Corindon ; Hauy. Ehomboedrischer Korund ; Mohs. Thonerde; Ilaus- mann. Korund; Haidinger. Khombohedral. 100,111 = 67° 34,'. 111, n 131 > e 197, v 1 13 11, aa' 60° o' U" 60 0 la’ 30 0 fl> 6 35 fa 23 25 bo 90 0 ro 67 31 do 38 12 lo 27 11 7)0 67 31 so 72 22 ao 90 0 VO 81 15 do 82 10 zo 79 36 VO 71 30 KO 72 31 wo 69 61 CO 61 15 no 61 11 qo 69 15 EIG. 263. FIG. 265. FIG. 261. FIG. 260. 11 1 •I II
