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246 OXIDES, EABTHS, AND ACIDS. The forms q, b are also hemihedral with asymmetric faces. The faces a, k appear upon the edges of the six-sided prism IV',... on which v, x, y do not occur. bo 90 c ' 0' Jib 167° 19' qb 159° 43' ao 90 0 <j>b 173 35 h b 161 31 kb 8 27 I>b 175 64 nb 174 39 ba 30 0 vb 8 52 sa 24 27 lb" 60 0 xb 12 1 la 42 17 Kb 7 29 yb 14 35 rr 85 45 fb 8 9 ub 18 29 rz' 46 16 yb 11 8 bs 37 58 qz 63 5 mb 14 42 bz" 66 62 Iz 77 20 rb 21 29 br 113 8 bz" 16 1 fib 25 17 ib 135 5 br 39 6 yb 38 13 bs" 142 2 br 46 55 db 57 35 6b 148 22 qr 49 29 ib 122 25 pb 151 37 qr' 36 58 zb 141 47 eb 154 65 qr" 25 37 lb 158 31 wb 157 34 .1 FIG. 269. FIG. 270. FIG. 271. x\ 4* / X / >v X b "]/ i n b* b \ FIG. 272. FIG. 273. FIG. 274. % ?>
