514 



NEW YORK STATE MUSEUM 



is reasonably accurate. The ferric iron given in the anah'sis is that 

 in the magnetite as thus determined. It is certainly somewhat low 

 since there is a strong probability of some ferric iron in the femic 

 minerals but there is an equally strong probability that the amount 

 is trifling, so that reasonable confidence -is felt that the figures 

 given are close to the truth. 



Since the same error in the iron determination is found in the 

 syenite analyses previously published, and since it is also desirable 

 to consider them with respect to their position in the new rock 

 classification, microscopic analyses were also made of them and the 

 figures for iron changed so far as determinations of the amount of 

 magnetite present would permit. As thus modified the analyses 

 should supersede those already published [N. Y. State Mus. Bui. 95. 

 P- 331-32]- 





I 



2 



3 



4 



5 



6 



7 



8 



SiOa 



A1203 



Fe203 



FeO 



MgO 



CaO 



NazO 



K2O 



H2O+ .... 

 H2O— .... 

 TiOz 



54-10 



17-45 



4-52 



6.47 



2-33 

 6.17 

 3.81 

 3 -06 

 0.48 

 0.09 

 . 19 

 0.88 



57.00 

 16 .01 



[ 10-30 ] 

 1 .62 

 6. 20 



4-35 

 3-53 



59-7° 



19-52 



1.89 



4.92 



.78 



3-36 



5-31 

 4.14 



•52 



61 .01 



15-36 



2.98 



7-77 

 .78 

 4-05 

 3 68 

 3-90 



•49 



63-45 



18.38 



1 .09 



2 . 69 



•35 



3.06 



5.06 



5-15 



•30 



•07 



65-65 

 16.84 



[ 4-01 

 [ > 



•13 

 2-47 

 S-27 

 5 -04 



•30 



66. 72 

 16.15 



J 1-23 

 ( 2.19 



■73 

 2.30 



4-36 

 5.66 



-77 



68.5 



14.69 



1-34 



3-25 



.26 



2 .20 



3-50 



5^90 



.40 



P2OS 



CI 













•03 















F 



0.05 

 . 14 



0-35 

 . 10 

















S 

















MnO 





.09 



.08 



trace 

 •13 





.07 





BaO 





-05 











1 



Total. . . . 



100. 19 

 .06 



99.16 



100 . 23 



roo . 10 



99-73 



99.71 



100 . 18 



100 . 22 





















100.13 

 2.964 



1 

 1 













Sp.gr 





2.674 





2.719 

















1 Basic syenite (andose) from near Raquette falls, analysis by 

 E. W. Morley. 



2 Basic syenite from Natural Bridge, Diana, Lewis co.. C. H. 

 Smyth jr, Geol. Soc. Am. Bui. 6:274. 



3 Augite syenite (laurvikose), road from Tupper lake to Waw- 

 beek, N. Y. State Geol. 20th An.^ep't. 1902. p. r69. 



