DOMAIN IV. TALCOUS. 



gists. Mr. Kirwan has indeed observed, that 

 serpentine is sometimes intimately mixed with 

 hornblende, or trap, in which case it is black. 

 It may in that case be regarded as a transition 

 from serpentine to Saussurite; and the connec- 

 tion between trap and serpentine has been al- 

 ready observed by Werner. 



Saussurite, in rolled pebbles, from the lake of 

 Geneva. 



The same, from the Alps. 



Saussurite, with nodules of steatite, from the 

 western isles of Scotland. 



With veins of amianthus, from the Pyrenees. 



This substance is common in Saussurite, and 

 evinces its magnesian nature. 



MODE VIII. GREEN GRANITEL. 



A genuine green granite, found among the 

 ancient monuments of Egypt, has already been 

 described in the account of that rock ; but that 

 beautiful substance is so extremely rare, that it 

 cannot interfere with the present object. The 

 Egyptian is composed of quartz, mica, and an 

 emerald green felspar; while the green granitel 

 here implied seems a mixture of felspar and si- 

 derite with steatite, the magnesia having even 



