PHYSIOGRAPHY. 



Blende. 



69 



3. It has been found only in veins with Native Gold, Galena, Blende 

 and Carbonate of Manganese. 



4. Its chief locality is Nagyag in Transylvania, from whence it ob- 

 tained its old name of Nagiaker-Erz. It is found also with Graphic 

 Tellurium at Offenbanya in the same country. 



BLENDE. DodecahedralSclerone-Blende. 

 Primary form. Rhombic dodecahedron. 

 Secondary forms. 



Fig. 65. 



Four of the obtuse solid 

 angles are replaced by tan- 

 gent planes, while the re- 

 maining four are unaltered, 

 except that they are formed 

 from six instead of three 

 plane angles, as may be seen 

 in the angle at o. 



P on e 



S on $ - 



144 44' 08 

 129 31 18 



TT v 



r 



