224 Elements of Mineralogy. 



100 gr. of this earth afford 8 of fulphtif* 

 befides gypfum, and a fmall quantity of iron* 

 Mem. Berl. 1 75 7. 



3 dly . Mixed with clay, iron and fetenite* 

 This compound is of a grey, brown or black 

 colour, found near Rome, in Auvergne, Spain 

 and Iceland. 2 Lin. *uon. Gmelin. 447. 



Ume-ftone^ in the form of a 

 calcareous hepar. This is found at Tivoli 

 near Rome, and elfewhere in Italy. Mem. 

 Par. 1770, p. 6. or diflblved in mineral wa- 

 ters ; 3 pounds of which fometimes contain 

 25 gr. of fulphur. 2 Gerh* Beytr. 17. It 

 often forms incruftations on the brinks of 

 thefe fprings. 



5 thly ' In the form of an alkalitie hepar* This 

 is laid to be found in fome waters in RuJJia* 

 Schab. Samm. 4 TheiL p. 544. alfo at 



Tivo/i. 



gthiy. u n lt e d to iron and clay in pyrites* 



Laftly, United to various metallic fub- 

 ftances, as fliall be feen in the next part. 



At Ramelfberg and the Hartz they extract 

 fulphur from the fulphureous ores of filver, 

 and lead mixed with pyrites, by fublimation 

 during the torrefaction of thofe ores : this 



forms 



