SiS 



NEW YORK STATE MUSEUM 



Or 30.41] 



Al. 

 An . . . 

 Qz.... 



Mt . . . 

 Di. . . . 

 Hy... 

 Ti . . . . 



■76 



42 

 12 .20 



6.0 



} 9i-42 



Class, ^ — L 



Fem. 



Order, § 



6.0: 



Q I -42 



7-94 



J 



,. 5 81 



2.00 



4.19 I 



0.17J 



Rang. 



7-94 



Subrang, 



F 85.37 

 K 2 Q' + Xs 



CaO' 



K 2 Q- _ 



Na 2 0' _ 



^3 

 81 



; = 1, persalane 

 5. canadare 



2, pulaskase 

 68 = 3, pulaskose 



= ii 6 = 3 .6 



Total 99.36 



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. by weight 



Quartz and feldspar 



Plornblende 



Pyroxene 



Magnetite 



Biotite 



Apatite 



Titanite 



Zircon 



Pyrite 



7444 



604 



165 



158 



60 



32 



38 



*3 



IS 



Total , 



3168 



! 5 2 9 



weight 

 87.28 

 7.08 

 T.94 

 I 85 

 o . 70 

 o-37 

 0.44 

 0.14 

 0.18 



99.98 



Or 33-42] 



Ab. ... 36.84 



An 



7.78 



~ * * ' ' ' - 1 

 Qz 13 -47 J 



Mt. . 

 Di. . . 

 Hy.. 

 Ap.. 



2 . 2 



3-59| 

 o-37J 



Norm of Little Falls syenite 



> 9*--S* 



Sal. 91.51 

 ClaSS ' Fem: = 87o4 



0r der,| = ^ 7 = 

 • F 78.04 



K 2 0' + Na 2 0' 



persalane 



v 8.04 



Ran -" -CaXT 



Subrang, K2 °' 

 Na 2 0- 



7 = 4. britannare 

 b36 



2 . 6= 2 , toscanase 



547 

 816 



.67 = 3, toscanose 



Total 99.55 



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

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

 to pulaskose. 



