258 OXIDES, EAETHS, AND ACIDS. distinct and interrupted. Fracture uneven. Opaque. Lustre imperfect metallic. Brownish-black. Streak dark reddish- brown, almost chesnut-brown. h = 6*0...5*6. G = 4*7...4*8. Conducts electricity feebly. Infusible before the blowpipe. Imparts a violet colour to glass of borax. Soluble in warm hydrochloric acid with evolu tion of chlorine. Concentrated sulphuric acid, to which it has been added in powder, assumes a bright red colour. MnMn, protoxide of manganese Ha 30*89, oxide of manga nese »n 69*02, or protoxide of manganese 93 02, oxygen 6*98. Analyses of hausmannite a from Ihlefeld by Turner, b from Ilmenau by Itammelsberg:— a b Protoxide of manganese . 92*00 92*49 Oxygen 7*09 7*00 Barytes 0*15 Silica Water 0*44 _ In attached crystals, granular masses and pseudomorphous after manganite and calcite. Is found in veins in porphyry associated with manganite at Oehrenstock near Ilmenau in Thuringia and at Ihlefeld in the Harz. Is said to occur at Leisa near Battenberg in the neigh bourhood of Marburg. 135. FBANKLINITE.—Franklinite ; Phillips, Beudant. Dodekaedrisches Eisen-Erz; Mohs. Franklinit; Ilausmann, Haidinger. Cubic. a loo cleavage, o ill, d Oil, n 211, p 122. ad co o o 0' 00 70 32 oa 54 44 M 60 0 do 35 16 no 19 28 nd 64 44 po 15 48 pd 19 28 Forms and combinations, o, d, od, dn, odp. Surfaco smooth.