365 ^riii/h Mlneralogical Society, 



were previouflv weighed. A ftrong effervefcence cnfued upofl 

 mixture : tlie gas produced was heavier than atmofpheric air J 

 extinguiflied flame; produced a clouded precipitate in hnie, 

 ftrontian, and barvtic water. 200 grains of the acid being 

 found not fuflicient for the folution of the fubftancc, 100 grains 

 more were carefully added : efl'ervefcence again took place, 

 and more of the fame gas was liberated. It was then expofed 

 to a heat of 200 degrees Fahrenheit. Upon cooling, it had 

 loft 46 grains. 



350 grains of the mofi: perfeft part of the fatin fpar were 

 rot foluble in 500 grains of nitric acid of the fjiecific gravity 

 1*25 : upon the addition of 250 grains more, there was ob- 

 tained a folution nearly colourlefs. It was then diluted with 

 didilled water, and evaporated to the confiftence of a ftrong" 

 fyrup, without exhibiting any fyniptoms of cryftallization,^ 

 though the evaporation was fufpended, and the folution fet 

 to cool, thrice during the procefs. The concentrated folution 

 became flightly yellovy. 



100 grains in folution in nitric acid, left to fpontaneous 

 evaporation in a warm, dry place, after Ilaiiding two months 

 exhibited no cryftals. 



jinalji/is. 



A. For the carbonic acid. — 250 grains of picked fpar were 

 diflblved in 757 grains of nitric acid of the fpecific gravity 

 of f25: the gas produced was received over mercury. It 

 changed the colour of tinfture of litmus red, and was ab- 

 forbed vvithin one-hundredth of the whole by barytie water, 

 civing a copious precipitate, which was foluble, and efier- 

 vefced upon the addition of diluted acid. 119 grains were 

 given off by this treatment, equal to 47 "6 per cent. 



B. For the calcareous earth. — Tlie nitric folution A was- 

 diluted with an equal quantity of diftilled water ; upon the 

 addition of diluted fulphuric acid it became nearly folid : it 

 was then further diluted and filtered. The precipitate, dried 

 in a heat of 213% weighed 433 grains. It was then brought 

 to a red heat, after which it weighed 330 grains. 



C. For the iron. — T\\f. folution B was then, treated with 

 oauftic or pure annnonia, which gave a flight red florulenf 

 precipitate. This pi'ccipitate, being filtered and dried, weighed 

 3 grains, equal to about 0'3 of metallic iron. 



D. The lolution C was then evaporated, during which, 

 previous to the formation of any crylbls of fulphate of am- 

 monia, 7 grains of cryftals of felcnite were depofiied of a filky 

 needle-formed appearance. 



E. The felcnite B and D, - 337 grain:^, were dccompofed 



bv 



