XVII 



SYNOPSIS 



247 



First Order of the Hypersthene-Augite Andesites. 

 Characters. — Felspar-lathes not in flow-arrangement. 



Formula. — Hypersth.-aug.^ matr., non-flu. 



Sub-order. 



Pyroxene 



of the 



groundmass. 



Granular 

 (gran.) 



2. 



Prismatic 

 {prism. ) 



3- 



Ophitic 



(oph.) 



Section. 



Presence or 

 absence of plagio- 

 clase phenocrysts. 



Plagioclase 



phenocrysts 



{phen.) 



No plagioclase 

 phenocrysts 

 (non-phen.) 



'3. Phen. 



4. Non-phen. 



Genus. 



Character 



of the 



phenocrysts. 



Glassy plagioclase 



phenocrysts 



(vitr. ) 



Opaque phenocrysts 



of plagioclase 



[opac. ) 



f 3- 



Large phenocrysts 



of pyroxene, over 



2 mm. (magn.) 



Small pyroxene 



phenocrysts, under 



2 mm. , or none 



(parv.) 



Species. 



Length 



of felspar 



lathes. 



•02 — 'I mm. 

 •I— -2 „ 



•3— -5 mm. 



Number of 

 specimens. 



12 

 4 



/ Not repre- 

 \. sented. 



Not repre- 

 sented. 



Not repre- 

 sented. 



Not repre- 

 sented. 



