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aa oo' oa dd’ da nri nn / na no nd o' 90' 70 82 64 44 HUMITE. EIG. 368. EIG. 369. 60 46 33 33 48 11 70 32 35 16 19 28 64 44 Forma and combinations, n', an', n’rt, o'n'rt. Twins. Twin face d. The faces n are striated parallel to their intersections with the faces d. The edges sometimes rounded. Semi-transpa rent... opaque. Lustre adamantine. Brown, inclining to yellow and black. Brittle, ii = 4’6...5'0. g = fi-965. Before the blowpipe on charcoal melts with effervescence into a brown head, depositing a yellowish-brown sublimate on the charcoal. With soda yields bismuth. In salt of phos phorus leaves a skeleton of silica. Soluble in hydrochloric acid forming a jelly of silica. Analysis by Kersten :— Silica 22-23 Oxide of bismuth 69 - 38 lied oxide of iron 2-40 Oxide of manganese 0'30 Phosphoric acid 3’31 Water, hydrofluoric acid and loss . 2 - 38 In very small attached crystals, single or united in small druses and globular groups. Is found in the cobalt veins of Schneeberg, and at Briiunsdorf near Freiberg in Saxony. 197. HUMITE.—Humite, Chondrodite; Phillips. Chon- drodite ; llauy. Hemiprismatischer Chrysolith ; Mohs. Chon- drodit; Hausmann, Haidinger. Oblique. 101,100=64° o'; 111,010 = 37° 43'; 101,001 =36° 48'. a 100, b 010, 0 001, d 021, n Oil, k 023, W 401, U 201, v 403, z 101, e 403, r 201, X 401, m HO, f 111, p 211, 8 ill, h 112, I 221, t 221, i 421, q 623, g 423, y 223, 0 223.