Mineralogy and Geology. 127 



28. New Minerals; by M. Breithaupt, (Pogg. Ann., Ixix, 429.) 

 Pliniane. — This mineral has the composition and appearance of mis- 

 pickel. Density zz:6*282. It differs from that species in being oblique 

 in its crystallization, pertaining to the monoclinate system. 



Stannine of Cornwall. This species resembles somewhat a white 

 opaque garnet. It has little luster, a pale yellowish color, and is trans- 

 parent only upon the thinnest edges. It is compact and has a scaly 

 fracture. Hardness nearly that of quartz. Density =3*545. M. Plan- 

 ner finds it to consist of silica and alumina 36*5 for 100 of oxyd of 

 tin. It is infusible before the blowpipe. 



29. Telluric Bismuth from Brazil; by M. A. Damour, (Annales de 

 Ch. et de Phys., 3e ser., xiii, 372.) — This ore occurs in leaves of the 

 luster of polished steel, slightly flexible, very tender. According to 

 two analyses it contains 



Bismuth, . . . . 79-15 . . . 7840 



Tellurium, . . . 15-93 . . 15-68 



Sulphur, .... 3-15 . . - ) . M 

 Selenium, . . . 1-48=99-71 ] * J =9866 



Adopting 1330-376 for the atomic number of Bismuth, as determined 

 by Regnault and Rose, and 802-121 for the atomic weight of Tellurium, 

 we have the formula Bi 2 S 3 -f 3Bi 2 Te. The Schemnitz ore has the for- 

 mula Bi 2 S 3 -|-2Bi 2 Te 3 ; the Deutsch-Pilzen ore, BiS-f2Bi Te. 



30. Analysis of Copper blende; by C. F. Plattner, (Pogg. Ann., 

 Ixvii, 422.) — Copper blende of Haidinger is distinguished from Ten- 

 nantite, by a red streak and less specific gravity. The Tennantile of 

 Cornwall afforded Kudernatsch, copper 48-94, iron 3-57, sulphur 27-76, 

 arsenic 19-10, silver a trace, quartz 0-08=99-45. Plattner has ob- 

 tained for Copper Blende from Freiberg, copper 41-070, zinc 8-894, 

 iron2-2J9, lead 0-341, sulphur 28-111, arsenic 18 875, antimony and 

 silver traces =99-510. Admitting that Cu 2 S is isomorphous with Zn S 

 and FeS, they have the same formula, except the substitution of Zn S 

 m the latter for part of the Cu 2 S. The formulas are 



Tennantite, Ar S 3 -j-4(Fe, Cu 2 )S 



Copper blende, Ar S 3 +4(Fe, Zn, Cu 2 )S. 



31. Analysis of Phosphates of Copper from Nischne Tagilsk ; by 

 ». R. Hermann, (Jour. f. Prakt. Chem., xxxvii, 175.) 



T -l , Osyd of copper. Phospb. acid. Water. ..«**, , , TT ^ 



Libethenite, 65-89 28-60 5-50=PhO 5 +4CuO+HHO 



Bihydrite, 68-211 25304 6-485= Ph0 5 +5CuO-{-2HO 



Phosphorocalcite, 67-15 24-55 8-20 



£ hllte i 66-86 2314 1000=PhO 5 +5CuO+3HO 



Fagilite, 61-29 26-44 10-77=PhO 5 -j- 4C uO+3HO 



Phosphorocalcite is stated to be equivalent to equal proportions of 

 aihydrite and ehlite. 



32. On Mendipite ; by If. Schnabel, (Pogg. Ann., Ixxi, 516.) 

 Composition, lead 85-69, chlorine 9-87, oxygen 4'44=PbCl+2PbO. 



33. On a Native Antimonile of Mercury; by M. Domeyko, (B 

 zehus's Report on the Progress of Chemistry, 6th year ; Annuatre 



