CBINA 0LA7S. 125 



Analysis of CMna Clay, Eureka Mines, DeKalb Co. 



Silica 5 53.7300 



Alumina 34.5390 



Ferrous ozlde 8530 



Lime 4144 



Magnesia ,3420 



Alkalies '. tr 



Sulphuric acid 2018 



Phosphoric acid 0522 



'ignition '. 12.28 



102.4124 

 Total fluxes 1.609 



The following analysis of sample collected by writ- 

 er from the mines in 1897, gaye the following : 



Analysis of China Olay, Eureka Mines, DeKaU> Co. (No. 128.) 



Silica 82.11 



Alumina ■ 11.41 



Ferric oxide 1.40 



Lime tr 



Magnesia 661 



Alkalies i 1.80 



Ignition 4.001 



"" 4.001 



101.382 

 Total fluxes 3.86 



The rational analysis gave^ 



Clay substance '. 20.20 



. Quartz 69.20 



Feldspar 10-40 



99.80 



The feldspar percentage influences the fusibility of 

 this clay, and the difference in the two quantitative 

 analyses is due to the latter having been made on an 

 unwashed sample. ' 



