156 TRAVELS THROUGH 



7. Black compact lava, with dark grafs-greet7, 

 cryfolite-green, or emerald -green iherl, in hexa- 

 gonal and pyramidical prifms, of different bigneis -, 

 from Vefuvius. 



3. Ditto, with yellow hyacinth, or topaz-like 

 hexagonal fherl ; from Vefuvius. 



9. Ditto, with coloured blunt pebbles, or hard 

 natural vitrifications, on account of their hardnefs 

 more refembling the precious (lones than the above 

 coloured fherls. They are black, and then called 

 pietre obftdiane, dark-green, cryfolite, emerald, hy- 

 acinth, or topaz coloured j from Vefuvius. 



10. Grey or blue porous lava, in fome tranf- 

 verfal or perpendicular veins of monte Somma. 



11. Grey compaft lava, with black hexagonal 

 or cylindrical rnerl columns ; from Vefuvius. 



12. Grey compact lava, with frequent black 

 fherl-glimmer or merl-lamelles. The colour of 

 the lava and the bignefs of the lamelles very dif- 

 ferent. I have lavas from the dark-grey to white 

 colour ; and the lamelles, varying from larger 

 ones down to fmall fprinkled points. Thefe lavas 

 refemble fo much fome varieties of fine grey 

 granite, that one might might miflake them for 

 .granite. Their grain is rough and fandy to the 

 touch. They are common on the road from, Por~ 

 tic'i to Vefuvius in the ftone heaps at the left, by 

 which the vineyards of lachryma Chrifti are in- 

 clofed. 13. Grey 



