34 Klaproth on the Chemical Analysis 



precipitate which consisted of oxide of antimony and copper, 

 but which, when dry, scarcely weighed ^ of a grain. 



3. The remaining third of the muriatic solution was diluted 

 with 6 parts of water, and rendered again transparent by an 

 adequate addition of muriatic acid ; a plate of zinc was then 

 immersed, which eflPected the separation of 22 grains of metallic 

 antimony. 



The components, therefore, of 100 parts of the ore under 

 examination are, 



Copper . . (c 1.) 37.50) 37 75 



(dl.) 0.253 



Antimony . (e 3.) 22 



Zinc . . . (c2.) 5 



Iron . . . (cl.) 3.25 



Sulphur . . (c3.) 9.25^ 

 (d3,) 18.75 > 



28 



Silver . . . ( 6 ) 



>.>! 



tosether about 0.25 



Oxide of manganese (c 



Loss . . . 3.75 



loo 



(Here follow five other analyses of varieties of the same ore, 

 upon which the author observes, that copper, antimony, iron, 

 and sulphur, are alone to be regarded as the essential compo- 

 nents ; silver, mercury, and zinc, being merely accidental 

 additions.) 



Analysis of a Cupreous Sulphuret of Lead and Antimony, from 

 Clausthal in the Hartz. 



a. It was ascertained by previous trials that the quartzose 

 matrix of the purest parts of this ore bore the proportion of 

 about 13 to 100. 



226 o-rains, therefore, of the ore were heated to redness in 

 a glass retort, but nothing sublimed, and the ore appeared 

 merely to have undergone imperfect fusion. 



b. It was therefore reduced to powder, and digested in 4 

 ounces of a mixture of equal parts of nitric acid and water. 



