MINERALOGY. 215 



ments to be made to produce new metallic 

 compofitions. 



/. It is diiTolved by all the acids ; of thefe the 

 vitriolic acid has the ftrongeft attraction to 

 it, yet it does not difTolve it, if it is not 

 previoufly diluted with much water. The 

 abundance of phlogifton in this femi-metal 

 is perhaps the reaibn of its ftrong attrac- 

 tion to the vitriolic acid. 



g. Quickfilver amalgamates eafier with zink 

 than with copper, by which means it is 

 feparated from compofitions made with 

 copper. 



b. It feems to become electrical by friction, 

 and then its fmaller particles are attracted 

 by the loadftone ; which effects are not 

 yet perfectly investigated; but they may 

 excite philoibphers to make farther expe- 

 riments, in order to difcover whether the 

 electrical power ihews itfelf in the metals, 

 by being attracted by the loadftone, or 

 whether the magnetic power can be exerted 

 cm other metals than iron. 



SECT. CCXXVIII. 



Zink is found, 

 A. In form of calx, Zincum calciforme naturale. 

 i. Pure, Minera zinci calciformis pufa. 

 a. Indurated, Indurata. 



1. Solid. 



2. Criftallifed. 



This is of a whitifh grey colour, 

 and ks external appearance is like that 

 of a lead fpar -> it cannot be defcnbed, 

 but is eafily known by an experienced 

 eye. It looks very like an artificial 

 P 4 glafs 



