Site of the Ancient City of the Aurunci. 



251 



to page 231. 



of Siliceous Minerals, 



4th Division. Both Silicates f — example, Leucite. 



6th 

 6th 

 7th 

 8th 

 9th 

 10th 



One Silicate § ; one J — example, Scapolite. 



— Both Silicates ^ — example, Epidote. 



— One Silicate ■} ; one ^ — example, Lievrite. 



— One Silicate ^ ; one ^ — example, Nepheline. 



— Both Silicates | — example, Petalite. 



— One Silicate J ; one ^ — example, Murchisonite. 



The same is the case with the subclass containing water. 



