ANALYSIS OF A MINERA^., &C. J? 



quarts of boiling diftilled water, which immediately became 

 like milk; this was poured on a very bibulous filter, fo that 

 the liquor pafTed through before it had time to cool ; and 

 the white precipitate thus collecled, being well edulcorated 

 With boiling water, and dried on a fand-bath, weighed 63 

 grains. 



C. The waftiings were added to the filtrated liquor; and theand by fubfe- 

 vvhole was gradually evaporated at different times, between ^"^'^^J^P^'^J 

 each of which it was fufFered to cool, and remain undiilurbcd/w</, 

 during feveral hours. A quantity of cryfiallized muriate of 



lead was thus obtained, until nearly the whole of the liquor 

 was evaporated : to this laft portion a few drops of fulphuric 

 acid were added, and the evaporation was carried on to 

 drynefs ; after which the refiduum, being diflblved in boiling 

 diftilled water, left a fmall portion of fulphate of lead. 



The cryftallized muriate of lead was then diflblved in boiling 

 water; and, being precipitated by fulphate of foda, was added 

 to the former portion, waswathed, dried on a fand-bath, and 

 then weighed 120.20 grains. 



D. The filtrated liquor was now of a palebluifii-green, which Ammonia thre^r 

 changed to deep blue, upon the addition of ammonia; fome °^"*^^ ^^'''^' 

 ochraceous flocculi were colleded, and, when dry, were 



heated with wax in a porcelain crucible, by which they 

 became completely attra6lable by the magnet, and weighed 

 2.40 grains. 



E. The clear blue liquor was evaporated nearly to drynefs ; The Wue liquor 



and, being boiled with flrong lixivium of pure potafh, until ^^^P°V ^"^ ^°^^* 



. . 1 1 n J J. , r ' ,.^ , , ed with potafh 



the whole was almolt reduced to a dry mats, it was diflblved and then diflbl- 



in boiling diftilled water; and the black oxide of copper, being "^^^ i" ^^^'^^'^ g*^® 



collected and waftied on a filter, was completely dried, and <^W^» 



weighed 32 grains. 



200 grains of the ore, treated as here ftated, afforded. 



Grains. 



A. Sulphur ... - 34. 



B. Oxide of antimony - - 63. 



C. Sulphate of lead - - 120.20 



D. Iron .... 2.40 



E. Black oxide of copper - 32. 



But the metals compofing this triple fulphuret are evidently 



in the metallic ftate ; and white oxide of antimony precipitated 



Vol. IX,— SEPTBMBJiR, 1804, C from 



Produfts. 



