144 DETAILED REPORT ON ALABAMA CLAYS. 



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



Silica 8.80 



Alumina 61.84 



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° F., while at 2600° P., the shrink- 

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

 that it could be easily rubbed apart. 



&. 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° F., they were very porous, 

 soft, and of a slight yellowish tint; at about 2400° P. 

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

 amounted to 17 per cent., but the bricklet was still 

 scratched by a knife without much difficulty. In the 

 Deville furnace the bauxite was still uneffect^ at 

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



Its composition is : 



Analvsis of Bauwite, Rook Run, Cherokee Co., No. 2. 



Silica 18.30 



Alamio.! 54!!P 



Ferric oxide 1.36 



Ignition " 27.60 



10165 



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

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

 per cent, of water. 



