228 TRAVELS THROUGH 



Granite, in which the feld-fpath forms large white 

 parallelepiped fpots in the length of a finger, and 

 in the form of the fpots in Serpentine vera" antico. 

 The compofition of thefe fpots is of oblique cubic 

 larnelles ; and they feem to be a middle fubftance 

 of fherl and feld-fpath. Such Granites is the Co- 

 lonna die piazza di S. Felicita at Florence. In fome 

 other Granite and Granitello-columns in the out- 

 fide of the royal palace at Naples, and at Salerno^ 

 I have obferved large black fpots, occafioned by a 

 clcfer mixture of mica. But at Florence I faw a 

 grey Granite-colonne, with black fpots, that entirely 

 refembled Porfdo Serpentino ner* anlico, and feemed 

 to have been as pebbles inclofed in the (till duc- 

 tile mafs of the Granit. Finally, there are grey 

 Granites, which have ftierl-lamelles or Iherl-mica 

 inflead of the common mica. 



3. Granit o ncro, or rather ner *e lianco, confifts 

 of white quartz, fome fcarce or even no feid-fpath- 

 particles, and large oblong and black (herl-fpots, 

 which are here in the place of the mica. Com- 

 monly they have a columnar parallelepiped form, 

 are cubic where broken, and thus are a fpecies of 

 Horn-blende. Of this Granite is a column in S. 

 Prafitde at Rome, to the left of the entrance, to 

 the chapel -, where they keep the column on which 

 Chriit is faid to have been flagellated* (Mercuric 

 err ante di Roma, p. 235.) If the merl fpots be 



fo 



