1 82 Elements of Mineralogy. 



which he examined, 3 Bergm. 236, and the 

 reafon probably is becaufe the vitriolic acid, 

 difengaged by the combuftion of fulphur, is 

 in a phlogifticated ftate, and all its combina- 

 tions in this (late are eafily decompofed by the 

 marine acid which plentifully occurs in vol- 

 cafios. It is alfo faid to be found in the mi- 

 neral lake's of Tufcany^ 16 Roz. 363. which is 

 much more probable, as the vitriolic acid 

 when united to water eafily parts with phlo- 

 gifton, and recovers its fuperiority over other 

 acids : alfo on the furface of the Earth in 

 the neighbourhood of Turin. 



Vitriolic Ammoniac is eafily known : for 

 if quick lime or fixed alkali be thrown into 

 its folution, the fmell of the volatil alkali is 

 perceived ; and if this folution be poured 

 into that of chalk or ponderous Earth in the 

 nitrous acid, a precipitate will appear. 100 

 parts of it contain about 42 of real acid, 40 

 of volatil alkali,' and 18 of water. 



SPECIES IV. 



Seknite. 



J have already mentioned this iubflance 

 among the calcareous Earths. It is fre- 

 quently found in mineral and common 

 tprijpgs, and alfo in fea water. Its tafte is 



neither 



