-26 



NEW YORK STATE MUSEUM 



Composition and norm of Grenville quartz-syenite (dellenose) 1-M-5 

 from near Lake Catlin 





Chetn. 

 comp. 



Mol. 

 ratio. 



0, 



Ab. 



An. 



Di. 



Wo. 



Mt. 



Ti. 



Py- 



Qz. 



Si0 2 . . 



A1 2 0, 



Fe,0 3 



68.66 



12.98 

 2.89 



1 . 26 

 . 76 



2.63 

 2.05 



7-5° 

 0.48 

 .09 



O . IQ 



O .07 

 O .OI 



0.0S 

 . 24 

 .07 



•144 

 .127 

 .018 

 .otS 

 .019 

 .047 

 •°33 

 .080 



■ 479 



80 



. 199 . 028 . 041 



33 14 



1 



.009 



' "is 



17 



.002 





.386 



FeO 











1 





MeO 







19 









Ca'O 





14 





2 







Xa 2 



' "80 



33 













K 2 

















H,0 + 



















H 2 0— 























TiO, 



.002 

 .0005 











2 







P,0 5 



....:::. 















F 





















S 



. C02 

 .003 

















2 





MnO 









2 





1 







BaO 





























Total 



99.96 





.080 



.033 .014 .041 



.009 .018 .002 



.....386 



Or.. 



Ab. 



An. 



Qz.. 



Di.. 



Wol. 



Mt. 



Ti. . 



Py. 



Ap. 



44-37 

 *7-34^ 

 3-97 I 

 23.18] 



4-5°; 

 1.06 I 



4.20 



o.-33 



o.i5' 



0-15J 



86 



Class, 

 Order. 



Ran?. 



Total 99.25 



Sal. 



Fern. 

 



88.86 

 = =8.5= 1, persalane 



23.18 , . 



- v — 7q= -3 5 = 4- bntannare 

 r 65 . 60 



K 2 0' + Xa 2 0' 



113 



Subram 



CaO" 

 K 2 _0_ 



Xa 2 0' : 



80 



33 



47 

 2.4 



2.4= 2, toscanase 

 2. dellenose 



E. W. Morley, analyst. 

 Chemically this rock is sharply distinguished from the syenites 

 by the somewhat lower alumina and soda, and the high potash. 

 The slide shows the feldspar to be mainly microcline, though with 

 some mierocline-microperthite and microperthite. It shows con- 

 siderable quartz though by no means so much as the analysis indi- 

 cates, and the dark colored minerals are augite and titanite, very 

 little magnetite being present. The augite must therefore be high 

 in iron. The character of the feldspar is quite different from that 

 of the syenites, as indeed might be expected from the analysis, 

 and this constitutes the main difference between this rock and the 

 syenites. The augite must also be of quite different composition. 



