LIGNITE. 637 



occurs even in alluvial or recent sandstones. At 

 Bovey, there are seventeen strata. Jt is some- 

 times also found dispersed in small masses ; a 

 circumstance which happens more particularly in 

 the case of jet. 



Organic vegetable remains are found in lig- 

 nite, and it also sometimes contains mellite, 

 amber, and sulphur. 



SYNOPSIS OF LIGNITE. 



A. Jet. Hard and compact ; has a pitchy lustre 

 and takes a good polish : sometimes retains marks of 

 the wood whence it has been derived. 



In France, Spain, Germany, &c. In the for- 

 mer it sometimes occurs in recent sandstone. 



B. Surturbrand. Less compact and more brittle 

 than jet. 



Found in Iceland, in Sussex, and elsewhere. 



C. Friable : moor coal of some writers. 



Is found in the south of France: contains 

 marks of vegetables, and it occurs in sand and 

 marie. 



