-22 



NEW YORK STATE MUSEUM 



rocks. The field evidence of close relationship between the rocks 

 thus receives forcible corroboration. 



One half mile east of the locality from which the previous rock. 

 was obtained, on the north line of Litchfield park, occurs a beautiful, 

 coarse red syenite which differs from the last in holding little or no 

 quartz. Its calculation follows : 



Mode of red syenite (monzonose) io-C-i 



Units measured Sp. Gr. 



Micropertbite 1463 x 2 . 6 



Plagioclase 299 x 2 . 63 



H:r'':lenie 267x3 2 



Quartz 62x2.65 



Magnetite 32 x 5 . 25 



Apatite 1x3.2 



Zircon 2x4.3 



- weight 



';": ~eijr.: 



3803 = 



65.72 



786 = 



13 58' 



854 = 



14.76 



164 = 



2.84 



168 = 



2.90 



Total 2126 



Composition and norm calculated from mode 





Qz. 



Orth. 



Alb. 



Ar. :r. 



H " ~ . 



Mag. 



Ac a:. 



Zirc. 



Total 



SiO a 



2.84 



22.03 2 4-9° 

 6.24 7.06 



.5 - 9 ' 

 3-33 



7.29 

 1.08 







0.C5 





A1 2 3 







17.71 



2-75 



z-54 



Fe,0 3 





O . 7 ^ 











FeO 









I . 64 r. nr. 







MaO 









2 .OI 

 I.83 

 C . IT 

 O.05 









CaO 









1.82 





O.03 







3.68 

 4.4c 



5 7 7 

 0.02 



Xa.O 







4.20 





K,0 





5-72 









P 2 O s 











O.02 



O. 10 



Zr0 2 









- 





c - ; 







. 













Total . . 



2.84 



53-99 



36-25 



Q.C6 



14.76 



2.90 



O.65 



O.15 



100. oc 



The calculated norm is: 



Or. 

 34- 1] 



Ab. 



Class. 



. 2D 



Sal. 



Fern. 



An. 



11 .40 



_ 85.57 



14 



2 S2 



:: 



Di. 



5 • 53 



Z - Z = 



Hy. 

 4-74 



Mt. 



3-99 



11. dosalane 



Order. S 



Rang. 



°34 = 5. germanare 



£,0' + Xa 



:'J 



CaO" 



K 2 a 



Subrang. ^-^ = 



61 



71 



132 

 66 



.86 



"lor-zir.ase 



;. :" inzzni'Se 



Qz. 

 2.82 



Tudging by the previous case the silica and iron are a trifle out 

 of the way, the former too high and the latter too low. It might be 

 legitimate to modify the analysis proportionately with the differ- 



