NOMES V. AND VI. 



in which one would expect examples of decom 

 position ; but the specimens rather seem to be 

 long to the granular, and the cellular*. Ferru 

 ginous quartz seems the most liable to decom 

 position. 



NOME V. D. KERALITE. 



Mr. Kirwan has observed, that when trris sub- 

 stance begins to decompose it discovers the cha- 

 racters both of an earth and of a stone. Kar- 

 sten has the following articles. 



" S. 417- Hornstone, which in some parts is 

 quite decomposed to clay, and from thence has 

 acquired an earthy fracture. 



" 493. A decomposed hornstone, which is 



there called indurated fullers' earth. From 



t 



Mai nun gen." 



NOME VI. D. FELSPAR. 



This substance which, owing to a mixture of 

 pot-ash, is not of very difficult decomposition, 

 passes into bole or hthomarga, kaolin or porce- 

 lain earth, and other sorts of clay. It is parti- 



* Min. i. 387. 

 VOL. II. 



