MODE VIII. GRANITEL. 205 



only be properly classed with the simple rocks 

 of felspar or of quartz. There are therefore only 

 three genuine structures of granitel; namely, 

 1. Felspar with siderite. 2. Felspar and quartz.' 

 3. Quartz with siderite. 



STRUCTURE I. WERNERITE, FELSPAR WITH SIDERITE. 



The appellation has been derived from this Wernerite. 

 celebrated mineralogist, who well deserves to give 

 his name to one of the most important substances 

 in nature. It is also intended to compensate, * 



while it calls to memory, his noted syenite, a term 

 so ill chosen as to have introduced confusion, in- 

 stead of illustration. The syenite of Werner, as 

 already mentioned, consists of felspar with side- 

 rite, that is, the former is more abundant; but 

 in basalton, or grunstein, the siderite predomi- 

 nates, and gives a black or greenish colour ; while 

 Wernerite is generally reddish. Yet the syenite 

 of Werner sometimes contains quartz and black 

 mica, which infallibly constitute a granite; and 

 the stone should, in that case, be said to pass into 

 granite. The appellation of Wernerite is here 

 strictly confined to a mere arid sole admixture of 

 felspar with a smaller portion of siderite ; and as 

 colours form the meanest of all distinctions, no 

 consideration is paid to that circumstance. 



