98 



Lost nothing 

 by Ivrif. 



Treaied with 

 niunalic acuJ. 



Few grains of 

 quartz. 



No alumine, 



liarytes, 

 »trontian. 



magnesia, 



margnneseor 

 other sub- 



CRYSTALLrzED RED IRON ORE. 



lentil to that of a pea. The smallest crystals are frequently 

 fixed on the largest. 



a. A hundred grains of this substance, exposed for half 

 an hour to a vevy brisk red heat, suffered no loss. 



b. A hundred j^rains were powdered in an agate mortar. 

 The powder had the same brown red colour of oxide, of iron 

 at a aiaximum heated redhot in the fire, it wast boiled for 

 a nionient with concentrated muriatic acid of the spec. grav. 

 ©f l*l-65. IVo oxiajuriatic acid was formed during the so- 

 lution. The whole was dissolved except a few small grains 

 of quartz, which certainly were no constituent principles of 

 the uiineral, bince they were not coloured by iron. 



c. The solution fj, which had the same colour as muriatic 

 solutions of brown red oxide of iron, was divided into two 

 equal portions, and one of these was subjected to the follow- 

 ing trials. 



a. Part of it was decomposed by caustic potash in excess,^ 

 and the solution was boiled on the precipitate. After filter- 

 ing and neutralizing with nrturiatic acid, caustic ammonia 

 Avas added, which did not form the slightest cloud in the 

 solution ; but it would })ave become turbid, if it had con- 

 tained any alumine or other substance dissolved by the caus- 

 tic potash. 



S. Diluted sulphuric acid occasioned no precipitate in 

 the first solution, whence it follows, that the precipitate con- 

 tained neither barytes nor strontian. 



y. Another portion was decomposed by an excess of am- 

 monia, and the precipitate separated by filtration. Oxa- 

 late of am'monia added to the colourless liquid did not 

 render it in the least turbid. It contained no lime there- 

 fore. 



5. Another part of the first solution having been decom- 

 posed by ammonia, and tiie precipitate separated, the 

 supernatant fluid was boiled with carbonate of soda; and 

 as it underwent no change, it certainly contained no mag- 

 nesia. 



f. IMuriate of barytes did not render the solution turbid. 



d. The other half of the solution b was neutralized by 

 ammonia, and the oxide of iron precipitated by succinate 



of 



