5i8 



NEW YORK STATE MUSEUM 



Or 30 . 41 1 



Al 42.76 



An .... 12.20 



Qz 6. OS J 



Mt 1.58] 



Di 2 .00 I 



Hy 4. 19 f 



Ti o . 1 7 J 



Total 99.36 



91.42 



7-94 



Class, ^^ = 9i_li 

 Fern. 7 . 94 



r^ A Q 6.05 



Order, ^ = -5 ^ = 



F 85-37 



= 11.5 = I , persalane 



Rang, 



K2O' + Na^O' 



Subrang, 



CaO' 

 K2O' 



55 



NaaO' 81 



07 = 5, canadare 



=^ -^ = 2.6 == 2, pulaskase 



= . 68 ^ 3, pulaskose 



The rock falls close to the boundary between subrangs 3 and 4, 

 or is close to laurvikose, showing thus its close relationship with 

 the considerably more basic rock of analysis 3. 



The Little Falls rock (analysis 7) has beautiful cataclastic 

 structure with the production of much finely granular feldspar and 

 quartz which can not with certainty be distinguished in the thin 

 section. The quartz and feldspar had therefore to be measured 

 together in the determination of the mode. 



Mode of Little Falls syenite (toscanose) analysis 7 



Units 

 Units measured Sp. Gr. b 



Quartz and feldspar 



Hornblende 



Pyroxene 



Magnetite , 



Biotite 



Apatite 



Titanite 



Zircon 



Pyrite 



sured Sp 



. Gr. 



, by 



weight 





% 



weight 



2852 X 2.61 



= 



7444 



= 





87.28 



i8g X 3 



2 



= 



604 



= 





7.08 



50x3 



3 



= 



165 



= 





T.94 



30 X 5 



25 



= 



158 



= 





I 85 



20x3 





= 



60 



= 





0. 70 



10x3 



2 



= 



32 



= 





0-37 



11x3 



5 



= 



38 



= 





0.44 



3x4 



5 



= 



13 



= 





0.14 



3 X 5 





= 



15 



= 





0.18 



Total . 



[68 



.8529 



99.98 



Norm of Little Falls syenite 



Or.... 

 Ab. . . 

 An. . . 

 Qz.... 



Mt . . . 

 Di.. .. 

 Hy... 

 Ap... 



33 -42 1 

 36.84 



7-78f 

 13 -47 J 



1-85] 

 2 . 23 



3-59 

 0-37 



91-51 



8.04 



Sal. 9 1. 51 - 1 



„ — =„ =ii.37=»i, persalane 

 Fern. 8.04, '^ ' ^ 



13 47 



-'-,- — = • 17 == 4. britannax'e 

 78.04 ^ 



K2O' + Na^O' 136 



Ransr, ^^r-?^ = ~^- = 2. 6= 2, toscanase 



CaO , 52 



Subrang, ^^Q' = _547 

 NasO' 816 



Class, 



Order, § 

 F 



.67 = 3, toscanose 



Total 99.55 



The quartz-fddspar ratio is nearly low enough to throw the 

 rock into order 5 instead of 4, so that it is a toscanose close 

 to pulaskose. 



