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QGABTZ. \ PIG. 275. 247 Combinations, brz, brzt, brz<j>x, brzipax, brz\i, brzseOxu, Irzsx, brzex, brzrpsx, brz(x, brzpfx, brzpx, brzhmfxuq, brzffimsek, ^ }rz yfhnusx J brzytsx, brzfitnlpu, brzfihmwqxu. The faces b stri ated parallel to their intersections with the faces r; z fre quently dull, and smaller than r; X and sometimes y and u rough. Twins. 1. Twin-face o. The individuals are frequently united in such a manner as to present the appearance of a 8 ingle crystal. The faces s, x,y, u...are sometimes seen on each angle of one end, or of both ends of the twin crystal, or on three alternate angles of one end and the other three alternate angles of the other end. The hemihedral forms of the two individuals aro usually of the /same kind; sometimes, however, they are of different kinds. The line of separation of the two individuals is sometimes very irregular, as in fig. 276, where the faces z aro distinguishable from the faces r, by the quality of their surface, the former being covered with irre- 11 4