150 



Magnesuu 



Jvlore lime 

 and magnesia. 



Potask, 



Component 

 parts. 



BLACK CRYSTALLIfED AUGITE. 



Tcd hot, yielded 4| grains of lime. The remaining liquor, 

 being decomposed by carbonate of soda, yielded 5 grains of 

 calcined magnesia. 



y. The muriatic solution, decomposed by ammonia in ex- 

 periment b was precipitated boiling by carbonate of soda. 

 The precipitate washed and dried weighed 44| grains. This 

 was neutralized by sulphuric acid, and evaporated to dry- 

 ness. The hardened mass was triturated and lixiviated 

 gradually with a little water. The solution being evapo- 

 rated, left sulphate of magnesia, which was decomposed 

 by carbonate of soda, and 9 grains of tiarbonate of magnesia 

 were obtained. These, being deducted from the 44f of the 

 first precipitate, left for the carbonate of lime 35f grains, 

 which amount to 19^ of lime. The 9 grains of carbonate of 

 magnesia being heated red hot, S\ grains of magnesia were 

 obtained. 



B. Eighty grains of this stone reduced to an impalpable 

 powder were heated red hot with an ounce of nitrate of 

 barytes. The calcined matter was triturated with boiling 

 water, dissolved in muriatic acid, and then precipitated by 

 carbonate of ammonia. The filtered liquor was evaporated 

 to dryness, and the salt volatilized in a platina crucible. 

 An earthy salt remained, which was redissolved in water, 

 and decomposed by carbonate of ammonia. The filtered 

 jiquor was evaporated anew, and the salt volatihzed by heat. 

 A slight trace of muriatic neutral salt remained, which was 

 found to be muriate of potash, by its forming a few grains 

 of a triple salt with a solution of platina. 



A hundred parts of augite of Frascati therefore contain 



Silex Aa 



Lime e« • • • 4*5 7 



Magnesia «•••. 5 1 



/.... 3-7sr 



Alumine 5....... 



Oxide of iron c • 



Oxide of Manganese ••€?.... *. .« t . .< 

 Potash B a trace 



'48 

 .24 



- 8'75 



' 5 

 12 



1 



9875 



This 



