278 TRAVELS THROUGH 



fibres there appeared veins of white calcareous 

 fpar, which was acted upon by acids ; but in fome 

 places it was fo entirely petrified into the nature 

 of feld-fpath, that it refifted acids as well as the 

 friction of iron. 



6. White Amiant, more or lefs fine and afbeft- 

 like. 



7. Green Amiant, fcarce. 



8. White and dry Amiant-earth, or remains of 



deftroyed Amiantes. 



. 



The Gabbro-hills near Impruncta contain hori- 

 zontal beds of Granitom^ confiding of much white 

 feld-fpath, which is in fome places calcareous, of 

 .fome greenifli argentine cubic glimmer, and of 

 greenifh Serpentine-earth. I faw in Mr. Targioni Tcz- 

 zettfs collection, who accompanied me to Impru- 

 neta^ fome pieces of Granitone, which had been 

 found there, and were entirely deftitute of glimmer, 

 confining of large white parallelopipedons of white 

 feld-fpath, and a glue of green Gabbro-earth. 

 ^"he greenifli argentine and cubic glimmer of this 

 Granitone is friable into a fat talc-powder, and ap- 

 pears in the mafs of the flone in oblong parallelo- 

 pipedons, compound of lamella? or fmall cubes. 

 The Granitone-b$d& in the Gabbro-hills near Praia 

 are fo large, that they cut them into rnill-ftones. 







LET- 



