1 f A L t. LETTER V< 6j 



iron-veins in Valle Polifella deferve particular no- 

 tice, as running in lava. 



In Valle Pantena nd monte di fette fongi, in the 

 Veronefe diftricl:, there is in the lava a vein of a 

 reddifh-yellow indurated bole, ftrongly mixt with 

 copperas, which in the field difappears, and leaves 

 in the vein only ochraceous iron-ore. Next to that 

 place is manganefe. Lead-ore and blende arc 

 found in black lava, which has funk into the 

 fiflures of a calcareous hill (mbnt. fecund.} in 

 Vallt di Garno, in Eergamafco \ thefe minerals, 

 probably, have been either forced from under* 

 ground, or pre-exiftent in the fiffures. The fame 

 may be faid of the lead-ore iri lava, which has 

 been found in different old and new mines, and 

 Volcanic hills, called k Guizze in territorio di 

 fretto, near Ena ; and in the Cotticetti di Pofena ; 

 and of the lead, copper, and filver ore, in pyrites, 

 manganefe, and blend, which, in compound, vol- 

 canic, calcareous hills, and feveral old mines, has 

 been found, in former times, near Leogra, in the 

 Vicentine territory ; at monte Narro, monte Frifa, 

 inonte del Caftello di Piere y and feveral other places 

 towards the Weft, and in Recoaro. In the fame 

 place where they find cinnabar, in Tufcany, they 

 meet with black, hard, and- vitreous lavas, which 

 contain long fplendid antimony points, that feem 

 to] have been feparated from under ground, and 

 involved in its fluid mafles. 



F LET- 



