2 5 S A SYSTEM OF 



I. Potters lead ore, with limeftone, 

 flate-kernels andfhells, from Gragruf- 

 van at Boda in Rettwik, and in Da- 

 larne. 



c. Yellow or marcafitical copper ore, 

 with fmall pebbles. 



SECT. CCLXXVIII. 



2. Of fmaller pieces, Granulis lapidum et 



minerarum. 



a. Potters lead ore with a qnartzofc 

 fand, from EifFelsfeldt near Cologn in 

 Germany. 



f. Mountain green with fand, from Si- 

 beria. 



c. Cobalt ore with fand. 



d. Martial ochre with fand *. 



SECT. CCLXXIX. 



Observations on the Sax a or Stones, 



Befides the advantages which may accrue to 

 eeconomy by a perfect knowledge of the Saxa, the 

 miners or fubterranean geographers expect alfa 



* The Mitiira Arenacea or Sand- ores, cannot reafonably be 

 fepar.-ited from the fand-ftones, fince they are produced in the 

 fame manner ; befid?s, when they are poor in yield, they are 

 alfo employed to the fame purpofe, becaufe it is not eafy to 

 fmeit the metal out of them. The fand-ores, befides, "cannot 

 be ranked in a mineral fyftem as feparate fpecks of ores, be- 

 caufe they would then be arranged with refpeft to the kind cf 

 flone in which the ore occurs, and not the ore itfelf, which. 

 cafe cannot be admitted here. \\ might be urged, that ores,. 

 ir.t;:<d with the (tones of the very load, and not in form of 

 fand-ores, ought as well as them to be ranked among the com- 

 pound faxa ; but in that cafe there would be no end ot fpecies, 

 not could they ever be reduced into any order. 



another 



