400 GEOLOUY OF THE EUREKA DISTRICT. 



PLATE VTTI. 



\. itiiVdi.Mi;; Miiuosi'UKiin.iTic with a MAitKi:i> ii.ow sTRroTX'RE. 



Thill sicticiM KiO, iiiaKiiilicd (i(> ili;iiiii-teis. The aus"''"' ■""' ineKular lorm of thr ]ihenocry8ts of 

 (|iiarlz anil )i-lils|i:ir show^ tlic frai'tiircd charafter, 



2. i;iiy(ii.itk; <ii.ASSv an'i> iiAN'l>Ki>. 

 Tliiii siM'tidU 174, iiiaguilKMl 11 iliaiiirtiTs. Small iiheiiocrysts of frhlHjiar. 



