246 



A NATURALIST IN THE PACIFIC 



CHAP. 



Second Order of the Augite-Andesites. 



Characters. — Felspar-lathes of the groundmass in flow- 

 arrangement. 



Formula. — Au^;:, matr.^flu. 



Sub-order. 



Pyroxene 



of the 



groundmass. 



Section. 



Presence or 

 absence of plagio- 

 clase phenocrysts. 



Genus. 



Character 



of the 



phenocrysts. 



Speoes, 



Length of 

 felspar lathes 

 and prisms. 



Number of 

 Specimens. 



4- 

 Granular 

 {gran. ) 



Prismatic 

 {prism.) 



Plagioclase 



phenocrysts 



{phen.) 



No (or very few 

 and small) 

 plagioclase 

 phenocrysts 

 (non-phen. ) 



g. Fhen. 



ID. Non-phen. 



^3- 

 Glassy plagioclase 

 phenocrysts 

 {vitr, ) 



14. 

 Opaque phenocrysts 

 of plagioclase 

 {opac. ) 



15- 



Large phenocrysts 



of augite, over 



2 mm. (magn.) 



16. 

 Small augite pheno- 

 crysts, under 2 mm. 

 or none {parv.) 



17. Vitr. 





•I mm. 

 •2 „ 

 •3 » 



•5 » 



•I — "2 mm. 



18. opac. . 



19. Magn. 



20. Parv. 



21. Vitr. . 



22. Opac. 



23. Mapt. 



24. Parv. 



•02- 

 •I- 



•I mm. 

 •2 ,, 



10 



ID 



4 

 I 



Not repre- 

 sented. 



12 



14 



4 



3 



/ Not repre- 

 \ sented. 

 / Not repre- 

 \ sented. 



4 



4 



Not repre- 

 sented. 



Not repre- 

 sented. 



