112 THE IRON ORE DISTRICT OF EAST TEXAS. 



and has an almost white tint when dry. This is a very siliceous clay, and 

 contains mica disseminated through it in a considerable quantity. Tests are 

 reported as having been made of this clay for fire brick purposes, and the 

 specimen brick is said to have withstood a high degree of heat. This can 

 hardly be correct, as the brick shown contains enough iron to color it a 

 bluish brown, and the amount of alkalies in the clay, as shown by the an- 

 alyses, is very high. The process used in making this brick and the maker's 

 name could not be obtained. Thickness of bed, one foot 



The underlying deposit at this place is a light blue clay with a slightly 

 pinkish shade, laminated in thin layers, and where exposed on the Dainger- 

 field road, somewhat mixed with the upper deposit. At Hill's Nursery, on 

 the Linden road, the exposed thickness is about two feet, although it appar- 

 ently has a greater thickness. This clay is plastic, and stained in spots with 

 brown iron stains. Although containing some mica, it is much freer from that 

 mineral than the others. This clay will be found a much better fire resisting 

 article than the other clays, and if properly ground and mixed may give fair 

 results in fire brick making, although its refractory qualities will not stand 

 very high. Its plasticity will also make it useful as a pottery clay. 



Analyses. 

 The following analyses are of these clays: 



Upper deposit, D dinger field road. 



Silica 80.20 



Alumina 12.27 



Iron * 1.53 



Potash 1.34 



Soda 5.11 



Lime and magnesia Trace. 



100.45 

 Lower deposit, Linden road. 



Silica 58 . 20 



Alumina 23.97 



Iron 4.43 



Potasli 2 09 



Soda • 5 . 02 



Water 5.36 



99.07 

 The mixed clays found in association with these two deposits are suitable 



for the manufacture of clay goods where color* or fineness of texture do not 



enter, such as drain tiling, flower pots, etc. 



The extent of these deposits is over two square miles. The overlying cover 



