,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) lO-C-i 



Units 

 Units measured Sp. Gr. by weight % weight 



Microperthite 1463 x 2 . 6 = 3803 = 65 . 72 



Plagioclase 299x2.63 = 786 = 13-58 



Hornblende 267x3.2 = 854 = T4-76 



Quartz 62x2.65 = 164 = 2.84 



Magnetite 32x5.25 = 168 = 2.90 



Apatite ■ 1x3.2 == 3= °-°S 



Zircon , 2x4.3 = 9 = °-^5 



Total 2126 5787 100.00 





Composition and 



norm calculated from mode 







Oz. 



Orth. 



Alb. 



Anor. 



Horn. 



Mag. 



Apat. 



Zirc. 



Total 



Si02 



A1203 



2.84 



22.03 

 6 .24 



24.90 

 7.06 



3-9C 

 3-33 



7-29 

 1.08 



0-75 

 I .64 

 2.01 

 1-83 

 0. II 



■ 0-05 







.05' 61 .02 









17-71 



2-75 



2 .00 

 .90 







FpO 















2-54 



Mp-O 











. 





2 .01 



iVigl^ 



CaO 









1.82 





0.03 





3.68 



Na20 







4.29 



4-40 



K2O 





5-72 









5-77 



P^Oc 











0.02 



. 10 



.02 



ZrOo 















C . IC 





















Total. . 



2.84 



33-99 



36-25 



9 .06 



14.76 



2 .90 



0.05 



0.15 



100. 00 



The calculated norm is: 



Or. 

 34- 15 



Class, 



Ab. 

 37.20 



vSal. 



Fern. 



An. 

 II .40 



_ 85-57 

 14.26 

 2.82 



Di. 



5-53 



Hy. 



4-74 



Mt. 

 3-99 



2.82 



= 6.0 = II, dosalane 



Order, § = „ 



F 82.75 



.034 =^ 5, germanare 



Rang, 



K2O' + Na20' 



. CaO' 

 K.O' 61 



Subrang, ^^—^x = 7- = 



1^2 

 =i -^^— = 2, monzonase 



66 



NazO' 



^= 3, monzonose 



Judging by the previous cas^ the silica and iron are a trifle out 

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

 lecritimate to modify the analysis proportionately with the differ- 



