ElvISHA MITCHELL SCIENTIFIC SOCIETY. 3 



both by washing- and by the subsequent grinding- 

 which it receives. The following analysis* of the 

 washed and dried product ready for shipment shows 

 the general character of such material. 



anaia'sis of kaolin, harris mixk, near webster, n. c. 



Per cent. 



Free silica, silicic acid and sand 2.28 



Combined silica 41.62 



Alumina .... 40.66 



Oxide of iron 0.14 



Alkalies ; 0.46 



Lime none 



Mag-nesia trace 



Combined water 14.00 



Moisture 0.84 



Titanic acid none 



Total 100.00 



Man}' simJdar but smaller feldspathic and kaolin 

 dikes are found in the various other counties west of 

 the Blue Ridge, and at a number of these the feldspar 

 has been altered into kaolin for considerable depths be- 

 low the surface, but none of them have been worked 

 extensively for either the feldspar or the kaolin, except 

 the Harris clay-mine just mentioned. Also at various 

 points in the Piedmont Plateau, which extends east 

 of the Blue Ridge for from 150 to 200 miles, there are 

 to be found deposits of this kaolin which have doubt- 

 less orig'inated in much the same way as those west of 

 the Blue Ridge; but none of these are now worked 

 to any considerable extent. The age of these crystal- 

 line rocks in the Piedmont plateau and the mountain 



^ Made for the Harris Clay Co. of Dillsboro, N. C. at the Pitts- 

 burgh Pa. Testing Laboratory. 



