t 142 ] 



Genera of MineralsJ 

 I. SALIA, Salts or Chryftals; 



13. NiTRuM. Nitre, at mofpherical, pungent 



A peculiar acid, 

 Chryftal: an hexaedral prifm, 

 with hexaedral pyramids. 

 Tajie : cold and pungent. 

 In the fire : fufible and de- 

 tonating. 



14. Natrum, Natron; Sali : calcareous, fub-al- 



kaline, 



Chryftal: peculiar; a te- 

 traedal prifm, of penta- 

 gonal planes, two broad 

 and two narrow, alter- 

 nately vertical : each 

 pyramid or extremity 

 forming two plane pa- 

 rallelograms. 



Tafte : bitter. 



In the fire : liquefying,' 



15. Borax, Borax. Salt: alkdl'me (doukful whe-^ 



ther it is a natural fait,) 

 Chryftal : odaedral, prif- 

 matic ; both pyramids 

 truncated. 



(Chryftal fometimes dif^ 

 ferent,) 

 Tafte : mild. 



In the fire: bubbling : vi- 

 trefcent, 



16. MvRIAi 



