TfATJMAJTITITE. 151 blowpipe, and melts into a grey, rather malleable bead. After long-continued roasting, with soda, yields a globule of copper. , Cu s Se, copper 6i - 62, selenium 38 - 48. Analysis by Berzelius :— Copper . . . .64 Selenium . . . .40 Was found as an extremely thin dendritic coating, on calcite, in the copper mine of Skriekerum, in Smaland, in Sweden. 40. ETTKAIBITE.—Seleniuret of silver and copper; Phil lips. Eukairite; Dufrenoy. Eukairit; Mohs, Hausmann, Ilai- diuger. Crystalline. Opaque. Lustre metallic. Lead-grey. Streak shining. Soft. In the matrass yields a sublimate of selenium and selenic acid. Before the blowpipe emits a smell of selenium, and melts easily into a grey, metallic globule. With borax and salt of phosphorus yields the reaction of copper, leaving a grey brittle globule of seleniuret of silver. By cupellation yields a globule of silver. Soluble in hot nitric acid. Cu J So + AgSc, silver 43’08, copper 25’29, selenium 3l’G3. Analysis by Berzelius :— Silver .... 38’93 Copper .... 23'05 Selenium .... 26'00 Earthy matter . . . 8'90 Was found in cleavablo grains in a copper mine, now for saken, at Skrikerum in the parish of Tryserum in Smaland, with copper and calcite in serpentine. 41. NAUMANNITE.— Seleniuret of silver ; Phillips. Ar gent seleniure; Dufrenoy. Selensilber ; Mohs, Hausmann. ■Naumannit; Haidinger. Cubic. a loo cleavage. ad 00° O'. Cleavage, a, very perfect. Opaque. Lustre metallic. Iron-black. Streak the same. Malleable, li = 2'6. G = 8'0. In the matrass melts and yields a slight sublimate of selenium and selenious acid. Melts before the blowpipe. With soda and it 4 tig. 137.