1(56 DOMAIN II. SILICEOUS. 



fracture ; and observes, that his petrosilex some- 

 times runs in layers in calcareous mountains ; so 

 that he has confounded the secondary horn stein 

 with the primitive felsite. When a stone passes 

 into jasper, it must properly belong to keralite or 

 rock-flint, which, like jasper, is infusible. 



STRUCTURE II. LAMINAR. 



This kind is observed by Saussure as already 

 menti^^d. It has been confounded by some with 

 keralite or hornstein. 



Kiinstein. The clink-stone of Werner, sometimes ridicu- 

 lously called basalte en tables by the French mi- 

 neralogists, may properly be classed under this 

 division, as having no connexion with the basaltic 

 modes, which are characterised by the abundance 

 of iron, but most intimate relations with felspar, 

 as will appear from the following analyses by 

 Vauquelin and Klaproth : 



FELSPAR. KLJNGSTEIN. 



Silex . . 62,83 57,25 



Argil . . 17,02 23,50 



Lime . . 3,00 2,75 



Potash . . 13,00 . Soda^ . . 8,10 



Iron . . . 1,00 (sianganese 0,25) 3,&5 



Loss . . 3,15 (water3) . 4,9 



100 100 



