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!U MAECASITE. 171 L C * Prismatic. 011,010=32° 26'; 101,001 =49° 5o'; 110,100=63° 2'-6. 0 001, e Oil, I 101, Z 102, V 103, z > v truncate the edge Ir. 104, m 110, s ill. ee 67° CO le 49° 60' me 90° o' ee' 115 8 ae 90 0 sa 67 35 re 16 30 ma 63 3 ea 90 0 VC 21 33 mm 73 65 si 45 27 ze 30 38 sc 63 5 FIG. 107. > FIG. 108. X/ Combinations. el, elc, mze, emlc, mlzc, eslc, emslc, emlzc, vmsizc. the faces c striated parallel to the intersections with and usually rough ; *, c striated parallel to their intersections m ^ ac j} °^ ier ' Iwms. 1. Twin-face m, mm — — 33° io\ 2. Ivvm-faco e. ca = _ ei° 62'. The individuals are often united to others according to the former law. Cleavage, m, toler- J distinct; I, traces. I< racture uneven. Opaque. Lustre e alJic. Light brass-yellow, sometimes inclining to green and grey Occasionally acquires a variegated or brown tarnish otreak dark greenish-grey. Brittle. h = 0'0...0'6. G = 4'C5... »■ Lnnts a smell of sulphur when pounded. PeS 2 , iron 40-67, sulphur 53’33. readil reactionB aro tbo same as tbose of pyrite. Decomposes frrn n li ly8 n ° f marcasito * h Y Berzelius, b, c by Hatchett, d Sclieidl 1 au C1US nUUe UCar Annabor S (Breithaupt’s kyrosite) Iron . . Manganese Sulphur . Silica . . a 45'07 070 63-35 0-80 b 45-06 64-34 C 40-40 copper 63-00 arsenic d 45-60 1'41 63-05 0-93 it follow?^ r d havi , n " the 8ame chemical composition, onows that Fes is dimorphous. i 2