242 TRAVELS THROUGH 



more credible, that S. Fiore, and the caftle-hili of 

 Radicofonii are remaining lava-lumps of the wide 



periphery 



colle&ions, and in fome others at Siena, the following foffils 

 found there. 



a. Black lava, with white garnet-like flierls, entirely refem- 

 bling thofe of Vefuvius. 



b. Piperino or Granito di S. Fiora ; a particular fort of 

 lava, compofed by a large quantity of white fherl in oblong 

 parallelepiped cryftals ; much black fherl-mica, and fome lava. 

 If the white fherl be fuperabundant, or more copious, it i* 

 called hereabout Pietra Salina. Such is dug in S. Fiore a 

 Plan Caflagnaro, near the abbey S. Safaadore, and all along the 

 Paglia ; and has been much employed in the ancient walls of 

 caftle Raditofani* The fame Pietra Salina ferved at Tolfa in 

 the fupports of the alum-pans. I have feen in Mr. Targioni 

 Tozzetti'j collections at Florence fome white fherl-parallelo- 

 pipeds, the length of a finger, and proportionably thick, 

 found in the Piperino di S. Fiora ; but generally they are 

 fmaller. Properly the name of Piperino is belongs only to 

 indurated volcanic afhes or tufo with fherl-cryftals ; accord- 

 ingly, the above-defcribed of S. Fiore, being a lava, fhould 

 not be called by that name ; fed merba valent Jlcut nummi. I 

 law in Siena two other varieties of this Piperino or Granlto t 

 which hft is a ftill more proper denomination. One 

 confifted in black fherl-grains and irregular garnet-like whit* 

 Iherl-cryitals ; and the other is a red earth, fimilar to a red 

 puzzolana, with regular garnet-like white fherl-cryftalliza- 

 tions. 



c. Black vitreous lava, entirely fimilar to the Iceland-agate. 

 d. Globular nodules of black lead or molybdrena, often of 

 the bignefs of a fill, 



e. Greeniifc, 



