292 A NATURALIST IN THE PACIFIC ch. xx 



of the type described before, either as separate crystals or 

 associated as intergrowths. The rhombic pyroxene crystals are 

 often sub-rounded with dark borders ; and as a rule the pyroxene 

 phenocrysts are much fresher than the plagioclase phenocrysts. 

 As far as can be ascertained, most of the original pyroxene of the 

 groundmass was monoclinic with a little rhombic. 



