226 TRAVELS THROUGH 



in the black fpecies 2 a. and fmaller than in the 

 Serpentino nero antic o, (2 b.} 



|3. Green porphyry, dark-green jafper-like, with 

 fmall roundifh and obbng white fpots, fimilar to 

 the red porphyry except in colour. 



<y. Green porphyry, trap-like and dark-green, 

 with Undetermined large white quartz fpots ; 

 thefe fpots often fo common that it may rather be 

 called a white fpecies , now and then the dark 

 trapp- green cryftallized into fherl-cryftals, and 

 then much refembling Granites, which have merl 

 inftead of mica. See the Granites 3, 4. 



'J. Green porphyry, with trap-like dark-green 

 fmall oblong, compact merl, in white fpots, com- 

 monly irregular, and twitted in maffes like fmall 

 worms ; called Porfido verde fwrito. 



i. Light-green porphyry, trap-like, with oblong 

 determined and regular white porphyry fpots and 

 fmall black fherl-cryftals. There is a column of 

 it at the Baptiftcry in the cathedral church at 

 Siena, among feveral columns, of Granite and 

 Granitello. 



VII. Oriental Granite. 



i. Granlto rcjjo confifis in white quartz, large 



pieces of red feld-fnath and black mica. There is 



i 



a violet 



