M 



THE STORY < >l THE EA 



ed is tyj .1 alternation 



of : the mineral quartz with some other 



minerals. Ea< h quartz film is made up of a num- 

 ber matted together, and i lally 

 little i separate the individual crys« 



m each other. The mineral, which alter. 



} !■.. i.- I .' structure, fr<-in (iairl«*:h in 



- its name to the BCl 

 -< hist, hornblende 54 hist, chlorite BChlSt. 



5U( h as identical with 



in mineral composition ; some are idem 

 mposition. 

 freq rumpled, as in the cliffs 



. head, w ith a inmutri 



en in slates. Like 



allized by th< I 



w hi( h < 

 l i ) I ...'. e ed al the sui I 



tion of n 



I t hem. 



j stalline qu; 

 to h.i\ i ii iginall 



: by partial solution i 



