126 DETAILED REPORT ON ALABAMA CLAYS. 



(No. 214.) 

 CHINA GLAY, 



FROM F. T. ANDERSON^ NEAR FORT PATNE^ DEKALB CO. 



This clay is rather sandy in its nature, unless 

 ground extremely fine, the granular cliaracter being 

 due partly to the halloysite which it contains. 



It slakes very slowly and incompletely, and took in 

 its air driedi 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 f urance, it was white and show- ' 

 ed traces of incipient fusion. At about 2350° F., it 

 burned white without a trace of yellowish color, and 

 w'th a total shrinkage of 11 per cent. 



It is evident that this material could be used in the 

 manufacture of wbite 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, DeKan Co. (No. 214.) 



Silica < 53.50 



Alumina 34.45 



Ferric oxide .21 



liime .30 



Magnesia trace 



Alkalies .21 



Ignition 13.20 



101.87 

 Total fluxes 72 



