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HEDETTTHITE. 159 meyerite and redruthite c from San Pedro in Chile; d, e, f from Catemo in Chile, all by Domeyko :— a b o d e f Copper . . 30'48 30-95 53-38 63'94 eO'58 63'98 Silver . . 52'27 52'71 28’79 24'04 16-68 12'08 Iron . . 0’33 024 — 2-09 2 31 2 53 Sulphur . . 15-78 16-92 17'83 19'93 20 - 53 21’41 In crystals, usually massive and disseminated. Is found in crystals at liudelstadt in Silesia, massive at Schlangenberg in Siberia, mixed in various proportions with redruthite at Catemo near San Felipe de Aconcagna and San Pedro Nolasco in Chile. A variety from Freiberg, according to Lampadius, contains 18'6 per cent, of sulphide of silver. The isomorphism of stromeyerite, cVs + Ags, and redruthite, Cu 2 s, is an indication that AgS is isomorphous with Cu 2 s. But argentite belongs to the cubic system. Hence probably Ags is isodimorphous with Cu 2 s. 50. BEDKTJTIIITE.—Vitreous copper; Phillips. Cuivre sulphure; Ilauy. Prismatischer Kupfer-Glanz; Mohs. Kup- ier-Glanz; llausmann, Haidinger. Prismatic. 011,010=30° 57'; 101,001=44° 8'; 110,100=59° 47'-5. a ioo, b oio, c ooi, e 203, d 201, m 110, n 320, P ill, v 112, z 113. b truncates the edge mm, e truncates the edge cd, n truncates the edge am, v truncates the edge zp. ec 32° 64' dc 62 44 ac 90 0 dd' 125 28 na 48 52 ma 69 48 mm 60 25 zc 32 44 fle 43 67 pc me za va pa pp 1 zb vb pb 62° 36' 90 0 74 13 09 69 03 28 63 4 62 9 63 9 39 53 FIG. 148. Combinations, mac, bmac, zee, mpdac, mpudac, mpzea bmpdeac, mpzndeac. The faces c striated parallel to their intei sections with a. Twins. 1. Twin-face m. 2. Twin-face ■ Clonvage. m, traces. Fracture conchoidal. Opaque. Lusti metallic. Blackish lead-grey, sometimes iridescent. Streak tli same, shining. Very sectile. 11 = 2-5...3-0. G = 5"6...6'8. Before the blowpipe 011 charcoal imparts a blue colour to th