258 



Subsurface Geologic Methods 



Certain Hydrous Oxides 



Degrees Centigrade 



Pocos de Coldot, 

 Bronl 



Richmond , Mo ss. 



"White Bouiile" 



Chester, IMoss I 1 h 



Teios, Po I 1 1 ^ 



Gobbs.Nevodo i ^ 1- 



Lohe Superior I I 



Roi bury , Cortn 



I Goethite 



Degrees Centigrode 



Figure 108. Curves of gibbsite, diaspore, brucite, and goethite shown for comparison. 



