2i 8 Elements of Mineralogy. 



SPECIES X. 

 Bovey Coal, Taub Kohle. Xylanthrax. 



This is of a brown, or brownifh black co- 

 lour, and lamellar texture, the laminse are fre- 

 quently flexible when firfl dug, though gene- 

 rally they harden when expofed to the air ; 

 it confifts of wood pen-etrated with petrol or 

 bitumen, and frequently contains pyrites, 

 alum, and vitriol j its afhes afford a fmall 

 quantity of fixed alkali, according to the 

 German chymifts ; * but according to Mr. 

 Mills they contain none ; '\ by diftillation it 

 yields an ill fmelling liquor, mixed with 

 volatil alkali and oil, part of which is foluble 

 in fpirit of wine, and part infoluble being of 

 a mineral nature. 



It is found in England^ France^ Italy ^ 

 ferland) Germany ', Iceland* 



SPECIES XL 

 Peat Geanthrqx. 



There are two forts of inflammable fub- 

 flances known by this name; the firft and 

 principal is of a brown, yellowifh brown, 

 or black colour, found in moory grounds, 



iGerb. Beytr. 271. f Pbil. Tratts. 1760* 



