I 130 p 



e. Ferruginous Steatite. 

 C. ARGILLACEOUS. 



a. Calciferous Argillite ; colour dark, blackifh, 

 or bluifh grey, or grey with black or deep blue 

 blotches, or reddifh or yellowifh grey ; more rarely 

 greenifh grey ; frafture flaty, but of fingle lami- 

 nae, fplintery, or conchoidal. 



b. Talcose Argillite ; colour whitifh, or bluifh, 

 or greenifh grey ; often invefted with foliated fte- 

 atites ; found in large mafTes; fra&ure flaty, curved. 



c. SUicifsroTis Argillite; penetrated with filice- 

 ous fchiftus, fand, jafper, bafanite, or quarts; 

 colour dark, blackifh, or bluifh grey, rarely 

 greenifh grey ; fra&ure flaty, but of iingle lami- 

 nae ; fplintery, or conchoidal. 



dfrxiil b • •' - ■ ■ ■ ib ■ • / > 1 • 



d. Ferruginous Argillite ; penetrated with calces 

 of iron, of a bluifh brown colour ; externally, it 

 has fome luftre ; internally, none ; fomewhat of 

 a ftriated, as well as of a flaty appearance. 



e. Hornblende with Garnet; of a dark greenifh 

 red, or reddifh dark green, according to the pro- 

 portion of garnet; fra&ure earthy, or fine fplin- 

 tery. 



f. Hornblende Slate with Talc or Mica; co- 

 lour greenifh grey 5 fra&ure flaty, and thin, the 

 laminae not eafily feparable ; found in great plenty 



at 



