E 59 1 



b. White mnndic, white pyrites or marcafite, 

 mineralized with fulphur and iron. 



Arfenic is found principally in the Bohemian 

 and Saxon mines ; but the richeft native orpi- 

 ment is brought from Turkey and Natolia. 



N. PLATINA, PLATA SILVER, Or PLATINA I>E 



pinto, introduced into England in the year 

 1749. Is eighteen .times heavier than water, 

 difficult of fufion, and hardens mo ft metals orr 

 mixture refembles filver in color. This metal- 

 lic drofs or recrementum is faid to be found in 

 the gold mines of the Spanifh Weft Indies. 

 Vide Lewis's Philofophical Commerce of Arts, 

 Lehman's German Mineralogy, and MarcgrafPs 

 Opufculas. 



O. Nickel is a femi-metal, which was firft dis- 

 covered about the middle of the prefent cen- 

 tury * ; is about 8 ~ times heavier than water,' 

 of a coppery color. It is found united with 

 iron, arfenic, fulphur, and particularly with 

 cobalt and bifmuth. Its folution in the nitrous 

 and muriatic acids is green. The vitriolic acid 

 has little or no effecT: upon it. 



a. Copper-nickel, " mineralized with fulphur, 

 arfenic, and copper, refembles copper." 



In the preceding obfervations on foffils, 

 effcrvefcence with acids, and ftriking fire with 

 fteel, have often been mentioned : it would be 

 neceiTary, therefore, for a traveller in fearch of 

 foflil fubftances, to have with him a bottle of 

 aqua fortis, or the nitrous acid, and a fteel, to 

 difcover thereby on the fpot certain properties 



* This metal was difcovered by Cronftadt. See the 

 , Royal Academy of Sciences at Stockholm, for the years 175 i 

 and 1754. 



of 



