126 DETAILED REPORT ON ALABAMA CLAYS. 



(NO. 214.) 



CHINA CLAY, 



FROM F. Y. ANDERSON, NEAR FORT PAYNE, DEKALB CO. 



This clay is rather sandy in its nature, unless 

 ground extremely fine, the granular character being 

 due partly to the halloysite which it contains. 



It slakes very slowly and incompletely, and took in 

 its air dried condition 30 per cent, of water to work 

 it up. 



The air shrinkage of the bricklets was 7 per cent. At 

 cone 27 in the Deville furance, it was white and show- 

 ed traces of incipient fusion. At about 2350 P., it 

 burned white without a trace of yellowish color, and 

 wHh a total shrinkage of 11 per cent. 



It is evident that this material could be used in the 

 manufacture of white ware. It would, however, take 

 much grinding to develop its plasticity fully. 



The tensile strength was from 60 to 65 pounds per 

 square inch when the material was ground to 60 mesh, 

 and the briquettes are very constant in strength. 

 With finer grinding the tensile strength would very 

 probably increase. 



The chemical analysis yielded : 



Analysis of China Clay, F. Y. Anderson, DeKalb Co. (No. 214.) 



Silica 53.50 



Alumina 34.45 



Ferric oxide 21 



Lime 30 



Magnesia trace 



Alkalies 21 



Ignition 13.20 



Total fluxes 



