402 GEOLOGY OF THE EUKEKA DiSTltiOT. 



PLATE VI. 



1. MICROPKGMATITIC STIUTCTTKK IX GKANITK-POKI'HYRY. 



Thin section 16, magnified 100 diameters. Intergrowth of quartz and feldspar. The quartz is the 

 lighter colored portion in the form of triangles and rhombs. 



2. PLAGIOCLASK FELDSPAR IX IIORXHLF.VDK-M1CA-ANDK8ITE. 



Thin section &5, magnified 32 diameters. Between crossed uicols, exhibiting the parallel growth of 

 twinned individuals and zonal structure. 



