648 APPENDIX. red oxide of iron 2007, lime 15-43, oxide of copper l'94. Is found in granite at St. Just near Penzance in Cornwall, and Calton Hill near Edinburgh. JEFFERSONITE.—An augite containing some oxide of zinc, g = 3*31.. .3'5. Melts on the edges into a black slag. Analysis by Hermann silica 49’9l, alumina 1-93, protoxide of iron 10-63, protoxide of manganese 7’00, lime 15-48, magnesia 8-18, oxide of zinc 4-39, loss by ignition 1-20. Is found at Frank lin in Hew Jersey. KEILHATTITE.—Cleavage in one direction, distinct; traces in two other directions. Fracture small conchoidal...uneven. Translucent. Eustre, on the plane of perfect cleavage vitreous, on the surfaces of fracture resinous. Brownish-black; by transmitted light brownish-red. Streak light greyish-brown. H = 6-5. G = 3'89. Before the blowpipe melts easily with ebullition into a bright black slag. Soluble in borax, to which it imparts the colour of iron. In the inner flame the bead becomes blood-red. With soda shows the presence of man ganese. In fine powder is completely decomposed by hydro chloric acid. Analyses by Erdmann:— Silica 24-45 Titanic acid .... . 29-01 28-14 Alumina 6-90 Red oxide of iron . . 6-35 0-48 Oxide of manganese . 0-67 0-80 Oxide of cerium . . 0'32 0-03 Yttria 9'74 Lime . 18-92 18-08 Is found massive in Buon not far from Arendal in Norway. KNEBELITE.—Fracture imperfect conchoidal. Opaque. Glimmering...dull. Grey, green, brown, g = 3'714. In fusible. With borax melts into a dark olive-green glass. Is readily decomposed by hydrochloric acid. Compact. Fe’si + An*si. Analysis by Dobereiner:—silica 32'S, protoxide of man ganese 35"0, protoxide of iron 32'0. LE PID 0 ME LANE. — In six-sided prisms. Cleavage, parallel to the base of the prism, perfect. Opaque. Lustre vitreous, inclining to adamantine. Black, in very thin scales green by transmitted light. Streak mountain-green. Bather ri e. h = 8-0. G = 3'0. Before the blowpipe melts into a a magnetic enamel. Easily soluble in borax forming a