MODE XI. JASPER. ]Q3 



ments. He observes that jasper is generally 

 schistose. A late traveller has informed us that 

 mountains of jasper extend for perhaps more 

 than a thousand miles through the eastern part 

 of Siberia, including Gore Island, between that 

 country and North America. On the contrary 

 the grand chains of European mountains seldom 

 or never present this substance ; which is chiefly 

 found in Sicily, Bohemia, and Saxony. 



It must be observed that many of the jaspers 

 rather belong to lithology or gemmology, being 

 only found in geods or small veins. Nor is it 

 intended to be affirmed that they all belong to 

 the siderous domain, though the black, the red, 

 and the green, which are found in the greatest 

 abundance, appear always to belong to that di- 

 vision ; and it may be observed that these co- 

 lours also occur in basaltin, like which also jas- 

 per occurs in columns at Dunbar, in Scotland. 



STRUCTURE I. COMMON. 



Aspect 1. Black jasper. It is doubtful whether 

 this substance, the basanite or Lydian stone of 

 Werner, form entire mountains, though Kirwan 

 seems rather to imply that it does: but the sili- 

 ceous schistus of Werner, which includes basanite, 

 is so vague an appellation as to convey no idea ; 



