ITALY. LETTER VIII. 85 



/. Perfect regular parallelopipeda of white fherl, 

 more or lefs calcined, of the length and the pro- 

 portionate thicknefs of a ringer, incloied in black 

 lava, belonging formerly to the collection of Afi- 

 cheli, who neglected to take notice of the place 

 whence it was brought. This lava refembled the ' 

 Serpent ino antico^ but it was large fpotted. 



g. A phofphorefcent felenitical fpar, iimilar to 

 the Bolognefe, common in Tufcany in detached 

 fragments, in the fractured clay and limeftone 

 beds, which are called Gallejlri. 



h. Selenite in tranfpare,nt rhomboidical-cryftals 

 from feveral places in Tufcany. 



i. Argillaceous nodules, by exficcation or dry- 

 ing cracked in feveral places, from Val d*Arno 

 fopra Firenze. Some of them half flint or horn- 

 ftone, and covered by a white terraceous furface. 

 There are likewife in the Val d'Arno feveral geodes 

 and other lufus nature. 



k. White argillaceous alum-ftones, fimilar to 

 thofe from Tolfa, from feveral places in Tufcany, 

 See Tozzettis Travels. 



L Gabbro, or ferpentine-flone., with white fpots, 

 from Cecina nella maremma Volterrana^ where it is 

 found ftratified , the fame white, black, red, or 

 green, with inclofed afbeftus, from Prato; black 

 with mica, from Monte f errata di Praia, has often 

 white calcareous fpar-veins, and is called by the 

 G 3 common 



