iyi A SYSTEM OF' 



argillaceous vein crofTes the veins of the 

 iron ore, and will perhaps be found to 

 have more of thefe riches, even in fevc.- 

 ral other places, if well fe arched, as is 

 done in other countries, oftentimes not 

 on fuch evident marks or figns. 



SECT. CLXIX. 



B. Diffolved and miner alifed, Argent urn miner a- 

 lifatum, 



i. With fulphur alone, Argent um' fulphure 

 miner alifatum. Glafs filver ore, r Minera ar- 

 gent i vitrea. 



This is ductile, and of the fame colour 

 V as lead^ but, however, becomes blacker 



in the air. . It has, therefore, very unde- 

 fervedly got the name of glafs ore, for that 

 name rather belongs to the miner a argent i 

 cornea^ or horn filver ore, if indeed any 

 iilver ore can be confidered as glafly. 



It is found in the fame manner as na- 

 tive gold ♦, viz. 

 i. In cruris, plates, or leaves. 

 2. Grown into, 

 a, Snaggs, and, 

 i?. Criftafline figures. 



It is generally either of a lamellar 

 or a grained texture, and is found at 

 Kohgfberg and in the Saxon mines. 



The glafs filver ore is the richeft 

 of all filver ores ; fince the fulphur, 

 which is 'united with the filver in this 

 ore, makes out but a very fmall quan- 

 tity of its weight. 



SECT. 



