CHINA CLAYS. 



35 



China Clays. The clays used in the manufacture of porce- 

 lain and fine white earthenware, which, from absence of iron 

 burn white or nearly white at moderate temperatures, are called 

 china clays. Their composition varies between somewhat wide 

 limits, some having very nearly the composition of vein kaolins, 

 while most of them contain a much higher percentage of silica. 

 The china clays are associated with the older formations of the 

 state in Calhoun, Talladega, Cherokee, DeKalb, Etowah, and 

 perhaps other counties, and with the Tuscaloosa formation of 

 the lower Cretaceous in Marion, Colbert, Fayette, Tuscaloosa, 

 and Bibb. 



The composition of the various qualities of china clays as yet 

 examined in the state are shown in the appended table of analy- 

 ses. 



Table II Showing Composition of China Clays. 



8. J. R. Hughes', 



Gadsden, Btowah |67.95|20.15|1.00|1.00| * |1.87| 8.00| 99.97 



county I I I I | j j I 



*Trace. 



