130 DETAILED REPORT ON ALABAMA CLAYS. 



Incipient fusion occurred at 2300 F., vitrification, 

 at 2500 F., and viscosity at over 2700 F. 



The clay burns at 2300 F. to a very white body. 

 The analysis of it yielded. 



Analysis of China Clay, Pearce's Mill, Marion Co. (No. 36, S.) 



Silica (combined) 38.60 



Alumina 32.50 



Water 11.05 



Clay base 82.15 



Silica (free) 17.68 



Ferric oxide 20 



Lime tr. 



Magnesia tr. 



Alkalies tr. 



Moisture . . 20 



100.03 



Total fluxes 20 



Specific gravity 2.33 



With washing, this clay would probably be well 

 adapted to the manufacture of the highest grades of 

 pottery. It contains less fusible impurities than most 

 of the kaolins used in this country, and the probabili- 

 ties are that if the deposit were constant in its char- 

 acter it might not require washing. 



(No. 56 S.) 

 CHINA CLAY. 



PEGRAM, COLBERT CO. 



A fine grained, whitish, homogeneous but not very 

 dense clay with a smooth fracture. 



In water it slakes slowly to grains under a sixtieth 

 of an inch (1-60 in.) 



Thirty per cent, of water was required to make a 

 workable mass, which to the feel was quite lean. 

 The air shrinkage of bricklets made from it was 7 per 



