ITALY. LETTER V, 39 



The white calamine feems to have been in this 

 vein produced by the folution of blende or black 

 jack in the vitriolic acid of the pyrites, precipi- 

 tated by lime, which is nearer related to the acid 

 than to the zinc ? ockre. 



There are likewife at Sckio Tome metallic veins 

 in the calcareous hangings or incumbent rocks, 

 which 1 fhall notice afterwards. In the hills near 

 S. Ulderico, at Tretfo, in the Vicentine territory, 

 have been, in former times, very deep filver mines, 

 and there is ftill to be found heavy rhomboidal 

 tefTelated fpar, which yields fome lead. 



Near Recoaro are old mines in flate ; but Mr. 

 Ardulni has been more particular on thefe parts in 

 his Letters to Mr. Valifneri. The mineral waters 

 near Recoaro fpring in cajcarepus hill, and form 



fine incrijftafions. 



' - > 



)OJjjfpw(y tb? calcareous Aty$ t 



(Dg Montibus fecundariis.) 



.. 



I have told you already, that they are, for the 

 moft part, of a fine compact impalpable grain ; 

 hat fcarce any of them are of a faline contexture ; ' 

 that they are formed in ftrata, containing n^ow anc] 

 then fomp marine petrifactions. But their ilrata'' 

 are very different, on account of their hardnefs, ; 

 grain, cgmpofition, larnellated texture, hardnefs 

 D 4 of 



