304 ANALYSIS OF ALTJM ORES. 



terward increased so as to fuse it. The mass when cold 

 'd^'d*^^ ^^"^ ^^^ ^^^^ appearance of a white enamel. It was well pow- 

 dered, muriatic acid poured on it to supersaturation, and 



and ilUuted evaporated to dryness. The residuum, mixed with water 

 \ritn. wstcr i. *> j 



and diluted, left behind silex, which after being heated red 



hot weighed 113 grains. 

 P&rt of the so- h. The muriatic solution was divided into two parts. Into 

 tated'bv'^rnuri- *^"^ ^^ these was poured a solution of muriate of barytes, 

 ate of barytes J and sulphate of barytes was precipitated, which after being 

 heated red hot weighed 50 grains; indicating 16-5 grs. of 

 concrete sulphuric acid. 

 the other by c. The other half was precipitated by ammonia, which 



ammonia. threw down the alumine. This when purified, washed, and 



roasted, weighed 19 grains. 

 The ore heated B. A hundred grains of the ore were mixed with 200 grs. 

 with nitrate of ^f crystallized nitrate of barytes, and heated red hot. The 

 sulphuric acid niass was pounded, mixed with water, and supersaturated 

 added, and pre- -vvith sulphuric acid. After evaporating till the saline mass 

 ammonii. ^ was moderately dry,, it was diluted in water, boiled, neu- 

 tralized with ammonia, and filtered. The liquor being eva- 

 porated, and the residuum heated red hot in a platina cru- 

 cible, left seven grains of sulphate of potash, which in^ 

 eluded four grains of pure potash. 

 Its component According to this 100 parts contain 

 r^^'^- Silex - - - - 56-5 



Alumine - - - 19 



Sulphuric acid , - - 16'5 



Potash _ - , 4 



Water - - - - 3 



99- 

 These as eiven These component parts are the same in kind as those 

 byVauqueJin, found hj Mr. Vauquelin, who gives them as follows : 

 Silex - -. - ^24 



Alumine - - - 43-92 



Sulphuric acid - - • 25 



Potash - - - 3-08 



Water - - .- - 4 



100- 



The 



