106 



perhaps, stands next to Cement-like Quartz, tab. 2iy, but 

 we do not know that the latter has any Alkali in it. 

 Klaproth found Pitchstone to contain 



Silex 73* 



Alumine 14*5 



Lime I* 



Oxide of Iron .... 1* 

 Oxide of Manganese _ . . 0* 1 



Soda ]-'/5 



Water 8-50 



Loss 0-15 



100-00 



