172 DETAILED REPORT ON ALABAMA CLAYS. 



The clay burned to a stiff buff body, which deepens on 

 hard firing. 



The composition is as follows : 



Analysis of Stoneware Clay, Rol>erts' Mill, Pickens Co. (No. 32 S.) 



Silica (total) 68.23 



Alumina 20.35 



Water 6.10 



Ferric oxide 3.20 



Lime .34 



Magnesia tr. 



Alkalies ■ .74 



Moisture 1.06 



100.02 



Free silica (sand) 43.23 



Total fluxes 4.28 



Specific gravity 2.17 



Tfiis clay might also serve for stoneware. >^It burns to 

 a buff color. 



In general composition this clay resembles somewhat a 

 stoneware clay used at Zanesville, Ohio*, which is given 

 below. It will be noticed however that while the per 

 centage of total fluxes is very close, the individal ones 

 differ somewhat in amount from those in the Alabama 

 clay. 



Analysis of Ohio Clay. 



Silica (combined) 25.40 



Alumina 21 13 



Water. 



6.29 



Ferric oxide 1 28 



Lime gj^ 



Magnesia -^g 



Alkalies 

 Moisture . 



1.80 

 1.65 



99.24 



Free silica (sand) 40.81 



Total fluxes 3 7Y 



•Ohio Geo. Surv. VII, 193. 



