CLASSIFICATION OF MINERALS. 



797 



OXYGEN salts: CLASS, — lODATES. 



There are but two luetnbers of this class, derivatives of I(0H)7, at 

 present Ivnowii amoug luiuerals. One is a uormal salt, the other a 

 double salt. 



Group 1. 



Cti(I03)... Monoclinic. 



Lautarite. 



Dictzeite, 



Group 2. 

 7Ca(IO:,):.8CaOrO, 



Monocliuic. 



OXYGEN SALTS: CLASS, — URANATES. 



The uranates, derivatives of U(OH)ii, or compounds of the oxides of 

 uranium with other oxides, are very complex in composition. They 

 contain, in addition to the oxides of uranium, the oxides of thorium, 

 zirconium, yttrium, and the cerium metals. Certain of the uranates 

 also contain nitrooeu and helium in an unknown state of combination. 



Uraiiinite. 



15r(iggerite. 



Cleveite. 



Niveuite. 



llranosphuTite. 



Group 1. 

 CoutaiuB UO2, UO;i, PbO, N, He, and A. 



Group 2. 

 (BiO)oU.,07.3HjO. 



Isometric. 



(?) 



D. COMPOUNDS OF ORGANIC ORIGIN. 



This division may be separated into two general groups — salts of 

 oxalic and mellic acids and other carbon compounds. This last com- 

 prises the various kinds of mineral wax, the fossil resins, the asphal- 

 tums, mineral oils, coals, etc. They are in general sinii)ly mixtures. 

 The salts of the organic acids, oxalates, and mellates only are here 

 given. 



SALTS OF ORGANIC ACIDS. 



Wlu'wellite. 

 < )xaiiimite. 

 Hiunboldtiue. 



Mellite. 



Group 1. Oxalates. 



CaCOi.H.O. 



(NH4),C.20^.2H20. 

 2FeCo04.3H,0. 



Group 2. Mellates. 

 AlCiiOii. 18H,0. 



Monocliuic. 

 Oithorlioiubic. 



(?) 



Tetragonal. 



