58 , Elements of Mineralogy. 



SPECIES VI. 



Barofelenite mixed 'with a notable Proportion 

 of Site*, Mineral Oil and Terrene Salts^ 

 Liver Stone, Lapis Hepaticus. 



It's colour is white, grey, yellow, brown, 

 or black; it is generally compaft, but not fo 

 hard as to give fire with fteel ; its texture is 

 either equable or laminar, fcaly or fparry* 

 and it takes a poliih as alabafter, 



It does not effervefce with acids. 



When calcined, it is partially reduced to a 

 fort of Plaifler of Paris. 



It emits a fmell of hepar fulphuris, at 

 leaft when rubbed. 



According to Mr. Bergman^ 100 parts of 

 it afford 33 of barofelenite, 38 of fil,ex, 22 of 

 alum, 7 of gypfum, and 5 of mineral oil. The 

 increafe proceeds from the water of chryfta- 

 lization. 



CHAP. VI, 



Muriatic Genus. 



Under this genus I include not only thofe 

 Earths and Stones in which magnefia predo- 

 minates, but alfo thofe in which the filiceous 



genus 



