144 DETAILED REPORT ON ALABAMA CLAYS. 



Analysis of Bauxite, Rock Run, Cherokee Co., No. 1. 



Silica ...................................... 8.80 



Alumina ................................... 61.64 



Ferric oxide ................................. 1.10 



Lime ........................... ; .......... trace 



Magnesia .................................. trace 



Ignition ............. . ...................... 29.97 



100.51 



No. 2. Two mixtures were made of this, viz : a. 

 which was 50 per cent, of grains between 15 and 

 20-mesh, and 50 per cent, smaller than 20-mesh. The 

 bricklet made from this showed a total shrinkage of 

 12 per cent, at 2400 P., while at 2600 F., the shrink- 

 age was 14 per cent, and the bricklet was so friable 

 that it could be easily rubbed apart. 



6. The bauxite was ground and passed through a 

 30-mesh sieve. In this condition it took 25 per cent. 

 of water to mix it up, and made a very lean paste. 

 The shrinkage of the bricklets made from this was 

 about 10 per cent at 2250 P., they were very porous, 

 soft, and of a slight yellowish tint; at about 2400 F, 

 the total shrinkage was 15 per cent, and at 2600 F. 

 amounted to IT per cent., but the bricklet was still 

 scratched by a knife without much difficulty. In the 

 Deville furnace the bauxite was still uneffected at 

 cone 30, but showed a total shrinkage of 27 per cent. 



Its composition is : 



Analysis of Bauxite, Rock Run, Cherokee Co., No. 2. 



Silica ...................................... 18.30 



Alumina ................................... 54 S9 



Ferric oxide ................................. 1.36 



Ignition .......................... ..... . ---- 27.60 



72. (No. 3.) Ground to pass through a 20-mesh 

 sieve, it gave a very lean mass on the additon of 25 

 per cent, of water. 



