56o 



SAMUEL WEIDMAN 



Fig. 3.— a. Hedenbergite-quartz-syenite (6639) ; X20. The minerals shown are: 

 alkali-feldspar (/e), quartz {q), fayalite {fa), hedenbergite {h), arfvedsonite {a), and 

 magnetite, the black mineral. There is also present a small amount of fluoiite and 

 apatite. 



6. Hedenbergite-mica-syenite (6597); X20. The minerals shown are: alkali- 

 feldspar (Je), brown mica {m), hedenbergite (Ji), fayalite (Ja), and magnetite. A small 

 amount of fluorite and apatite is also present. 



c. Hedenbergite-nepheline-syenite (6600); X20. The minerals shown are: 

 alkali-feldspar (/e), nepheline (w), hedenbergite {h), fayalite {fa), and magnetite. 



d. Fayalite-nepheline-syenite (5275); X20. The minerals shown are: alkali- 

 feldspar {fe), nepheline {n), hedenbergite {h), fayalite {fa), and magnetite. 



e. Fayalite-nepheline-syenite (5275); X20. The minerals shown are: alkali- 

 feldspar {fe), nepheline {n), fayalite {fa), and magnetite. 



