NOME IX. SUBSTANCES EJECTED Ofe CHANGED. 517 



Karsten, the mphiline of Haiiy, of a white or 

 greenish grey, found in the ejected rocks of Mount 

 Somma, which may be styled the parent of Vesu- 

 vius. Leucite is also found in the calcareous rocks 

 of Somma, according to Breislak : but the pyroxene 

 of Haiiy, the augite of Werner, of a dark brown 

 or green colour, rather belongs to granitic rocks. 



Limestone, with volcanic jacint and chrysolite, 

 from Vesuvius. 



The same with leucite, from Monte Somma. 

 Kirwan has strangely confounded the volcanic 

 jacint, or vesuvian of Werner, with leucite or white 

 garnet. 



Limestone with sommite, from Monte Somma. 



HYPONOME II. GRANITE. 



In this substance the felspar, which, owing to 

 the mixture of potash, is the most easily fusible, 

 is sometimes either melted or shattered by the 

 heat*. But the granitic lavas of Dolomieu, and 

 other French writers, seem problematic. That 

 patient observer says that he never saw them in 

 such abundance, nor with such convincing proofs 

 of having been fused, as at Sancta Fiora, on the 

 confines of Tuscany and the Papal territories. If 



* In the language of jewellers stunned, corresponding with the 

 jFrench etonnL 



