142 AESEETDES. pyrites, galena, calcite. Is found at Anclreasberg in the Hartz, Guadalcanal in Spain, Allemont in Prance, IVXexico, and for merly at Altwolfach in Baden. The arsenical silver of Andreasberg and Guadalcanal is sup posed to be a mechanical mixture of antimonsilber with arsenic or arsenical pyrites. 29. BEEITIIAUPTITE.—Nickel antimonial ; Dufrenoy. Antimon mckel; Mohs, Hausmann. Breithauptit; Haidinger. E/hombokedral. Ill, a oil, ao ad io u wo ww 100,111 = 59° 47'. i 231, w 251, 90° O' 60 0 26 22 25 40 56 5 49 2 ETG. 130. Fracture uneven...conchoidal. Opaque. Lustre metallic Light copper-red. Acquires a violet tarnish. Streak reddish- brown. Brittle, ir = 6'0. o = 7-541. , When heated in the open tube, a little antimony sublimes. Before the blowpipe on charcoal deposits a copious sublimate of oxide of antimony, leaving a residue of nickel fusible with great difficulty. Easily and completely soluble in nitromuriatic acid. Ni s Sb, nickel 31-43, antimony 68 - 57. Analyses by Stromeyer:— Nickel . . . 28-95 27-05 Iron .... 0-87 o-84 Antimony . 1 . 63'73 60-71 Sulphuret of lead . 6’44 12-30 The sulphuret of lead is supposed to be derived from a mechanical admixture of galena. Is found in thin tabular crystals, dendritic and disseminated at Andreasberg, with smaltine, galena, blende, pyrargyrite and arsenic. ’ ARSENIDES. 30. KUPFEENLCKEL.—Copper nickel; Phillips. Nickel arsenical ; Ilauy. Prismatischer Nickel-Kies; Mohs. Kupfer- mckel; Hausmann. Nickelin; Haidinger.