198 SULPHIDES. Pb 2 As, lead 67 - 2i, arsenic 20-69, sulphur 22 - io. Analyses by Damour:— Lead .... 65'40 66-61 Silver . . . 0’2l 0'17 Copper . . . o - 30 o*22 Iron .... 0*44 0'32 Arsenic . . . 20-69 20’87 Sulphur . . . 22"49 22 30 In crystals and disseminated. Is found with realgar, blende and pyrite, in narrow veins in the dolomite of St. Gotthardt. 86. BOULANGERITE.—Boulangerit; Hausmann, Ilai- dinger. Opaque. Lustre metallic, inclining to silky. Blackish lead- grey. Streak darker. Slightly brittle. 11=3-0. g=6-96...6-o. Before the blowpipe melts easily, emits sulphurous acid and fumes of antimony, and deposits a sublimate of oxide of lead upon the charcoal. Soluble in warm hydrochloric acid, with evolution of hydrosulphuric acid. / m Pb 3 Sb, lead 67"99, antimony 24'09, sulphur 17-92. Analyses of boulangerite a from Molieres by Boulanger, I from Nasafjeld by Thaulow, 0 from the Staroserentnischo mine by Bromeis, d from the Ljurgenskische mine by Bruel, e from Ober-Lahr by Abendroth, f from Wolfsberg by liaiu- melsberg. ale d e f Lead Iron Copper . Silver . Antimony Sulphur . 18-5 18-86 18-22 19 11 19-06 18’91 In granular, columnar or fibrous masses. Is found at Molieres in France, Obcr-Lalir in Sayn. Alten- kirchen, Nasafjeld in Lapland, in the Staroserentnischo and Ljurgenskische mines near Nertschinsk in Siberia. a 63"9 65"57 66’29 63"87 65"60 66"16 1'2 — — 1-78 — — 25"6 24*60 25"04 23"66 25"40 25'94 ' SCI 11JLZITE.—Geokronite ; Dufrenoy. Geokronit, Schulzit; Hausmann, Haidinger.