MINERALOGY. ie 9 



blended with the calcareous earth, with 

 which they melt to a corroding glafs, which 

 difTolves the flrongeft crucibles, unlefs 

 fome quartz or apyrus clay is added 

 thereto. 



5. When heated flowly, and by degrees, they 

 give a phofphorefcent light : but as foon 

 as they are made red-hot, they lofe this 

 quality. The coloured ones, and efpe- 

 ciallythe green, give the flrongeft light, 

 but none of them any longer than whilft 

 they are well warm. 



6. They melt and diffolve very eafily by the 

 addition of borax, and next to that by the 

 microcofmic fait, without ebullition. 



SECT. XCVIII. 



J.. Indurated Fluor, Fluor minerals indu~ 

 ratus. 



1. Solid, of an indeterminate figure, Fluor 

 farticulis impalpabilibus^ figura, indetermu 



natd. 



Is of a dull texture, femi-tranfparent, 

 and full of cracks in the rock. 

 a. White, found in Batgrufvan, at Yxfxo 



in Nya Kopparbesget in Vyeftmanland. 



SECT. XCIX. 



2. Sparry Fluor, Finer Spatofus. 



It has nearly the figure of fpar* though, 

 on clofe obfervation, it is found not to be 

 fo regular, nothing but the gloffy furfaces 

 of this ftone giving it the refemblance of 

 fpar. 



a. White, 



