MINERALOGY. 195 



SECT. CC. 



4. Diffolved by the vitriolic acid, Cuprum acido 

 vitrioli folutum : Vitriolum Veneris. See Seel:. 

 exxii. 



5. With phlogifton. Ccpper coal ore. See 

 Se£t. clxi. 



SECT. CCI. 



7. Iron, F err urn, Mars. It is 



a. Of a blackifh blue fhining colour. 



b. It becomes ductile by repeated heating 

 between coals, and hammering. 



c. It is attracted by the loadfbone, which is 

 an iron ore; and the metal idelf may alfo 

 be rendered magnetical. 



d. Its fpecifk gravity to water is as 7,645, or 

 8000 : : ioco. 



e. It calcines eafily to a black fcaly calx, 

 which,, when pounded, is of a deep red 

 colour. 



/. When this calx is melted in great quantity 

 with glafs compofitions, it gives a blackifh 

 brown colour to the glafs ; but in a fmalF 

 quantity a greenifh colour, which at lad: 

 vanifhes, if forced by a ftrong degree of 

 heat. 



g. It is diffolved by all falts, by water, and 

 likewife by their vapours. The calx of 

 iron is diffolved by the fpirit of fea-falt, and 

 by aqua regia. 



b. The calx of the diffolved metal becomes 

 yellow, or yellcwifh brown -, and in a cer- 

 tain degree of heat, it turns red. 



O. r-ri 1 

 2 i. l ne 



