324 Elements of Mineralogy. 



25. In the dry way zinc is reduced by 

 diftilling its ore after torrefaftion, with a mix- 

 ture of its own weight of charcoal, in an 

 earthen retort well luted, and a ftrong heat ; 

 but by this method, fcarce half the zinc it 

 contains is obtained. 



CHAP. X. 



Regulus of Antimony. 



i. Its colour is of a filvery white, its tex- 

 ture micaceous; its fpecific gravity, when 

 perfectly freed from iron, 6,860 ; it is re- 

 markably brittle; the nitrous acid dephlo- 

 giflicates it, but holds only a very minute 

 portion of it in folution. The marine has very 

 little effect on it, but it is in a coniiderable 

 degree, foluble in aqua regia formed of 7 

 parts marine, and i of nitrous acid ; or in a 

 mixture of the vitriolic and marine acids, or 

 even of the vitriolic and nitrous. It melts 

 long after it becomes red hot, emits a white 

 (moke, and evaporates, forming white flowers; 

 in clofe veflfels it fublimes without decompo- 

 lition. 



: SPECIES I. 

 Native. 



a. This was firft difcovered in the mine of 

 Sala in Sweden^ by that great metallurgist, 



Dr, 



