PHYSIOGRAPHY. 



White Lead-Ore. 



273 



5. It is employed, like the Iron Pyrites, in the manufacture of sul- 

 phur, copperas and sulphuric acid. 



WHITE LEAD-ORE. Di-prismatic Lead- 



Baryte. MOHS. 



Primary form. Right rhombic prism. M on M=117 C . 

 Secondary forms. 



Fig. 474. 



Nertechinsk, Siberia. 



Fig. 475. 



Johanngeorgenstadt. 



