MODE IV. LIGNITE. 



in the Asturias. In short, it is mentioned as oc- 

 curring in Iceland, in the western part of that 

 isle. 



" Of this combustible, ornaments are made, 

 particularly mourning trinkets. Jet is polished 

 with water, on a wheel of sandstone, worked ho- 

 rizontally. Jet, mingled with pyrites, is generally 

 rejected. 



" 2. Friable lignite*. This variety is found 

 in extensive and thick beds ; it is of a bright 

 black, but less bright than the preceding kind ; 

 what above all distinguishes it, is its great fria- 

 bility ; its surface is always cracked, and its mass- 

 es are divided, with the greatest facility, into a 

 number of cubic pieces, a character which lig- 

 nite jet does not present. In some instances, 

 the tissue of vegetables, which have formed it, 

 is observable. 



" Friable lignite is more abundant, and con- 

 sequently more useful than the two first varieties. 

 It is found in horizontal beds, often thick and 

 extensive, but is never found in such large mass- 

 es as coal, with which it has very improperly 

 been confounded. It not only differs by its pro- 

 perties, but it also differs in its locality. It is 

 found in masses of sand, which often fill calca- 



" * Moorkohle, mud coal. Broch." 



