266 



Subsurface Geologic Methods 



Alunite-Kaolinite Mixtures 



^ !§■ Degrees Cenfigrode 



ov^ / r^ i ' f' I ' f' I 'T 



gf 1 1 , "f > 



T — I 1 T' I — I r 



100 



80 20 



60 40 



40 60 



25 75 



10 90 



100 



I H 



h ^ h 



h — ^ h 



i ^ 



■ I I I I I I I I \ 1 I L 



100 300 500 700 900 



Degrees Centigrode 



1100 



FiGUKE 114. Thermally active kaolinite and alunite in artificial mixtures. 



