MODE II. ANTHRACITE. 



some kinds have a singular and highly metallic 

 lustre, approaching even to some iron ores of 

 Elba. 



STRUCTURE I. ANTHRACITE. 



Aspect 1. Compact. From Alliers, Mont 

 Blanc. 



From little St. Bernard, accompanied by fine 

 slate with vegetable impressions. 



Aspect 2. Laminar. From Regny, near St. 

 Simphorien. Other sites of both kinds are above 

 mentioned ; that of Kongsberg, in Norway, mixed 

 with native silver, being among the most interest- 

 ing. 



STRUCTURE II. KIRWANITE. 



The chief differences of this structure have been 

 already mentioned. Mr. Kirwan observes, that 

 when fresh broken it frequently appears of a vio- 

 let colour. Its lustre he estimates at 4, or metal- 

 lic ; while that of anthracite is from 3 to 4 ap- 

 proaching metallic. The fracture is foliated, but 

 the course of the plates variously, confusedly di- 

 rected, as in some kinds of common coal. Its 

 fragments are often coated with whitish illinitions ; 



VOL. i. 2 o 



