ITALY. LETTER TXIII. 313 



20. Cinnabar; from Marienberg in Saxony. 

 Extremely fcarce. 



21. Sal Gemmae', from Sicily. 



22. A calcareous breccia, or pudding-ftone, of 

 an alh-grey fubftance, with rofy-round fpots or 

 pebbles ; from monte Alcamo in Sicily, called brec- 

 cia rofata. 



23. A fpecies of porphyry, fimilar to the black 

 Serpentine antico, of a black fubftance, with white 

 fpots ; from Sardinia. 



24. Fine white clay, partly hardened into an 

 opaque milk-coloured, or white femi-pellucid flint; 

 fometimes ornamented with iron-dendrites, which 

 appears in little veins eroding the white clay; 

 from Baudt/fe in Piedmont, in the Canavefe; en- 

 tirely fimilar to the white china-clay, and the 

 white flints contained in it; which Mr. Peithner* 

 in his Mineralogy, calls Porcellanites, and is 

 found at Kaaden in Bohemia. 



25. Small petrified or foflil fimple Madrepores, 

 with five points at the under part ; from the 

 marl-hills in Piedmont. Thefe hills contain many 

 fcarce, undefcribed little marine productions. For 

 the greatelt part, they are iiv Mr. AUtone's collec- 

 tion, and dcferve to be drawn and defcribed by 

 him* 



26. Malachites in large lumps, flicking to cop- 

 per-azure 5 fromC0#0. 



27. Pe- 



