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530 SUXPHA.TES. WW 00 n' ma mm' nri m za zb zo 30 105 4' 24 66 34 50 50 78 20 116 55 57 0 44 20 65 19 45 41 64 18 ra rb re fa fb ft qa qb qa va Iib 56 73 69 FIG, 622. h 56' ve 22° 34' 2 Tea 80 62 6 kb 78 45 55 he 14 34 48 sa 33 7 43 sb 69 67 4 sc 64 49 3 ya 44 23 27 yb 63 58 58 ye 57 0 41 ya 58 40 yb 71 23 yc 37 36 ya 75 55 yb 26 20 ye 68 14 FIG. 623. <r Combinations. mc..a.n.m.b.o.y.z, md..c.o.y, od..a.z.m.y.c.b, mcd..a.o.s.y.z.u, ocd..m.z, loud..z.m.c, oadc..u.f.v.y.tr, omdc..a.y.z.- fb.g. Cleavage, m, c, perfect, c usually more readily obtained tban m; a, less perfect; b, still less perfect; z, d, traces. Fracture concboidal, seldom observable. Transparent...trans lucent. Lustre vitreous, inclining to resinous, n. = 1'8188, 1*6352. Colourless, wbite, grey, blue, yellow, red. Streak white. Brittle, h = 3*0... 3*6. G = 4*36... 4*59. Decrepitates when heated. Before the blowpipe in the inner flame is reduced to sulphuret of baryum, and becomes alkaline, imparting a yellowish-green colour to the flame. AVith borax melts into a clear glass which becomes yellow or brown on cooling. AVith soda forms a hepar, and sinks into the charcoal. AVith soda and silica yields a yellow or brown bead. Insoluble in hydrochloric acid. BaS, sulphuric acid 34*37, barytes 65*63. Part of the ba rytes is sometimes replaced by strontian. Analyses of baryte a from Freiberg by Klaproth, b from