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. 



1. 



Plagioclase 



phenocrysts 



(phen.) 



2. 



No plagioclase 

 phenocrysts 

 (non-pken.) 



3. Phen. 



4. Non-phen. 



Genus. 



Character 



of the 



phenocrysts. 



Glassy plagioclase 



phenocrysts 



(vitr. ) 



Opaque phenocrysts 



of plagioclase 



(opac. ) 



3- 



Large phenocrysts 



of pyroxene, over 



2 mm. (magn. ) 



Small pyroxene 



phenocrysts, under 



2 mm., or none 



( pa)~v. ) 



5- Vitr 



6. Opac 



7. Magn. 



8. Parv. 



(.ft 



Species. 



Length 



of felspar 



lathes. 



•02 — 'i mm. 

 •1— "2 ,, 



'3— '5 mm - 



f *02 — - i mm. 



I 'I— "2 „ 



f T>2 — - l mm. 



Number of 

 specimens. 



12 



4 



/ Not repre- 

 \_ sented. 



: 



Not repre- 

 sented. 



Not repre- 

 sented. 



Not repre- 

 sented. 



