MODE XT. JASPER. 101 



gravity, being much inferior even to tin or 

 copper. 



" Mountains of striped jasper occur in Siberia, sites, 

 and often with breccias, but without petrifac- 

 tions, per Herman. 1 Berg. Jour. 1791, p. 84 

 and 94; of red jasper, ibid. 88; and also of 

 green jasper, 2 Gmelin. 81. (French.) It often 

 forms thick strata in mountains of schistose mica 

 in the Apennines, Ferber, Italy, 109 ; and in 

 Siberia, 2 Herm. 281. In Saxony it is found 

 alternating with, and sometimes mixed with, 

 compact red iron-stone, 2 Berg. Jour. 1788. 

 485. 



" In the south of France it occurs, reposing 

 on granite, and underlaying basalt, 3 Soulavie. 

 72. In the Altaischan Mountains it has never 

 been found in contact with granite, but it some- 

 times underlays argillite. 6 Nev. Nord. Beytr. 

 115."* 



At Salisbury Crags, near Edinburgh, a curious 

 jasper, spotted with metallic iron, occurs under 

 the basalt. Saussure and Dolomieu have ob- 

 served that jasper is chiefly of an argillaceous 

 nature, more or less penetrated with oxyd of 

 iron. Patrin has given an interesting account 

 of the mountains of jasper in Siberia f, where he of Siberia. 



* Kirwan, G. E- 177. t ii. 266. 



