Trans. N.Z. Inst., Vol. LIIT. 



Plate XXVI. 



Fig. 1. — Graphic intergrowth ot quartz and orthoclase in pegmatite. Boulder from 



conglomerate in oldermass, Mine Bay Creek. Crossed nicols. X 26. 

 Fig. 2. — Granulite with garnet (black, in centre) from conglomerate in oldermass, Mine 



Bay Creek. Crossed nicols. X 26. 

 Fig. 3. — Granulite from conglomerate in oldermass, Mine Bay Creek. Crossed nicols. 



X 26. 

 Fig. 4. — Hypersthene with resorbed borders in " second period " andeside, Kaitoke 



Valley. X 26. 

 Fig. 5. — Section of a typical " second pericd " andesite, showing a phenocryst of 



hypersthene and the characteristic fine groundmass. X 26. 

 Fig. 6. — Phenocrysts of zoned plagioclase and of quartz in quartz-porphyry from 



headwaters of Mine Bav Creek. Crossed nicols. X 26. 



