ITALY. LETTER XI. 157 



13. Grey compact lava, with white fherl-gar- 

 nets ; from Vefuvius. 



14. Ditto, with hexagonal (herl-columns, or 

 with cylindrical ones, called ftangen-fpath. 



15. Red compact lava, of a fanguine or red- 

 brown colour. 



a. With white vitreous merl-garnets, at the 

 right hand on the road and fhore, from Naples to 

 Puzzuoh) near this place and the houfe of the 

 galley- (laves. 



b. With xvhite cylindrical Iherl-columns or flan- 

 gen-lpath. Ibidem. 



c. With fmall milk-white points ; from Vefu- 

 vius. All thefe varieties are much refembling the 

 Oriental porphyry. 



1 6. Black vitreous lava, or pretended Iceland 

 agate, is a perfect hard glafs, and intirely fimilar to 

 that of Hecla. I have fome pieces from Vefuvius, 

 from Capo di China near Naples, from the ifland 

 Ifcbia, and from Sora on the limits of Naples and 

 the Roman dominions. A green variety of this 

 lava-glafs is Ibmetimes found covering or glazing 

 the black flaggifh ferruginous Vefuvian lava, Ni. 

 I faw in Abbate Bottis* collection a fragment of 

 this vitreous lava, which was black grey coloured, 

 and contained inclofed, betides many fmall hexagonal 

 white merl-cylinders, a great many fmall white 



(herl- 



