CLASSIFICATION OF MINERALS. 



789 



OXYdEX SALTS: CLASS, — ARSENATES AND ANTIMONATES. 



This class, derivatives of H3RO4, H^RO^, etc., includes those com- 

 pouuds of oxides with oxides whose negative parts are taken by arsenic 

 pentoxide or antimony pentoxide. They are similar to the pliosi»liates 

 in molecular structure, and, like them, are either normal or basic salts 

 both with and without water of crystallization. Further, they may 

 crystallize Avith a fluoride, chloride, or hydroxyl. As a class they pre- 

 sent many analogies to the phosphates, and like salts, as a rule, are 

 isomorphous. 



droit}) 1. 



