272 Notice of some Recent [April 



termed it plagionite, from (irAay*o<r oblique) in consequence of 

 the oblique form and inclination of the axis, which measures 

 107° 32'. It consists, according to Rose, of 



Lead 40-52 



Antimony . . . 37*94 

 Sulphur .... 21-53 



99-99 



Besides simple sulphuret of antimony, in the Wolfsberg 

 antimonial veins, there are a great many combinations of 

 sulphuret of antimony and sulphuret of lead in different 

 proportions, viz : zinkenite, 3 Sb. su. + Pb. su. Plagionite, 

 Federerz, Bournonite. The two first have only been found 

 at Wolfsberg. {Poggendorff, xxviii. 421.) 



16. Native Litharge has been found half way up the volca- 

 noes of Popocatepetl and Iztacictualt in Mexico, correspond- 

 ing exactly in appearance and composition with that derived 

 from the lead furnaces, (Ann. des. Mines, yi.J 



17. Arsenical Pyrites has been analyzed by E. Hoffmann 

 from four localities : 



Sulphur . 

 Copper . 

 Bismuth . 

 Arsenic . 

 Nickel . 

 Cobalt . 

 Iron . 

 Serpentine 



18. Arsenic Ulance. — Karsten found the composition of 

 a specimen from Marienberg, in Saxony 

 Arsenic .... 96-785 

 Bismuth . . . 3-001 



99-786 

 (Schweig. Seidel, xxiii. 390.) 



